diff --git a/SabreTools.DatItems/DatItemTool.cs b/SabreTools.DatItems/DatItemTool.cs
index 6890a77b..847f724f 100644
--- a/SabreTools.DatItems/DatItemTool.cs
+++ b/SabreTools.DatItems/DatItemTool.cs
@@ -13,11 +13,13 @@ namespace SabreTools.DatItems
     /// </summary>
     public static class DatItemTool
     {
+        #region Field Replacement
+
         /// <summary>
         /// Replace fields with given values
         /// </summary>
         /// <param name="datItem">DatItem to replace fields in</param>
-        /// <param name="repMachine">DatItem to pull new information from</param>
+        /// <param name="repDatItem">DatItem to pull new information from</param>
         /// <param name="datItemFields">List of fields representing what should be updated</param>
         public static void ReplaceFields(DatItem datItem, DatItem repDatItem, List<DatItemField> datItemFields)
         {
@@ -34,824 +36,41 @@ namespace SabreTools.DatItems
 
             #endregion
 
-            #region Adjuster
-
-            if (datItem is Adjuster adjuster)
-            {
-                Adjuster newItem = repDatItem as Adjuster;
-
-                if (datItemFields.Contains(DatItemField.Default))
-                    adjuster.Default = newItem.Default;
-
-                // Condition_* doesn't make sense here
-                // since not every condition under the other item
-                // can replace every condition under this item
-            }
-
-            #endregion
-
-            #region Analog
-
-            else if (datItem is Analog analog)
-            {
-                Analog newItem = repDatItem as Analog;
-
-                if (datItemFields.Contains(DatItemField.Analog_Mask))
-                    analog.Mask = newItem.Mask;
-            }
-
-            #endregion
-
-            #region BiosSet
-
-            else if (datItem is BiosSet biosSet)
-            {
-                BiosSet newItem = repDatItem as BiosSet;
-
-                if (datItemFields.Contains(DatItemField.Description))
-                    biosSet.Description = newItem.Description;
-
-                if (datItemFields.Contains(DatItemField.Default))
-                    biosSet.Default = newItem.Default;
-            }
-
-            #endregion
-
-            #region Chip
-
-            else if (datItem is Chip chip)
-            {
-                Chip newItem = repDatItem as Chip;
-
-                if (datItemFields.Contains(DatItemField.Tag))
-                    chip.Tag = newItem.Tag;
-
-                if (datItemFields.Contains(DatItemField.ChipType))
-                    chip.ChipType = newItem.ChipType;
-
-                if (datItemFields.Contains(DatItemField.Clock))
-                    chip.Clock = newItem.Clock;
-            }
-
-            #endregion
-
-            #region Condition
-
-            else if (datItem is Condition condition)
-            {
-                Condition newItem = repDatItem as Condition;
-
-                if (datItemFields.Contains(DatItemField.Tag))
-                    condition.Tag = newItem.Tag;
-                else if (datItemFields.Contains(DatItemField.Condition_Tag))
-                    condition.Tag = newItem.Tag;
-
-                if (datItemFields.Contains(DatItemField.Mask))
-                    condition.Mask = newItem.Mask;
-                else if (datItemFields.Contains(DatItemField.Condition_Mask))
-                    condition.Mask = newItem.Mask;
-
-                if (datItemFields.Contains(DatItemField.Relation))
-                    condition.Relation = newItem.Relation;
-                else if (datItemFields.Contains(DatItemField.Condition_Relation))
-                    condition.Relation = newItem.Relation;
-
-                if (datItemFields.Contains(DatItemField.Value))
-                    condition.Value = newItem.Value;
-                else if (datItemFields.Contains(DatItemField.Condition_Value))
-                    condition.Value = newItem.Value;
-            }
-
-            #endregion
-
-            #region Configuration
-
-            else if (datItem is Configuration configuration)
-            {
-                Configuration newItem = repDatItem as Configuration;
-
-                if (datItemFields.Contains(DatItemField.Tag))
-                    configuration.Tag = newItem.Tag;
-
-                if (datItemFields.Contains(DatItemField.Mask))
-                    configuration.Mask = newItem.Mask;
-
-                // Condition_* doesn't make sense here
-                // since not every condition under the other item
-                // can replace every condition under this item
-
-                // Location_* doesn't make sense here
-                // since not every location under the other item
-                // can replace every location under this item
-
-                // Setting_* doesn't make sense here
-                // since not every setting under the other item
-                // can replace every setting under this item
-            }
-
-            #endregion
-
-            #region Control
-
-            else if (datItem is Control control)
-            {
-                Control newItem = repDatItem as Control;
-
-                if (datItemFields.Contains(DatItemField.Control_Type))
-                    control.ControlType = newItem.ControlType;
-
-                if (datItemFields.Contains(DatItemField.Control_Player))
-                    control.Player = newItem.Player;
-
-                if (datItemFields.Contains(DatItemField.Control_Buttons))
-                    control.Buttons = newItem.Buttons;
-
-                if (datItemFields.Contains(DatItemField.Control_RequiredButtons))
-                    control.RequiredButtons = newItem.RequiredButtons;
-
-                if (datItemFields.Contains(DatItemField.Control_Minimum))
-                    control.Minimum = newItem.Minimum;
-
-                if (datItemFields.Contains(DatItemField.Control_Maximum))
-                    control.Maximum = newItem.Maximum;
-
-                if (datItemFields.Contains(DatItemField.Control_Sensitivity))
-                    control.Sensitivity = newItem.Sensitivity;
-
-                if (datItemFields.Contains(DatItemField.Control_KeyDelta))
-                    control.KeyDelta = newItem.KeyDelta;
-
-                if (datItemFields.Contains(DatItemField.Control_Reverse))
-                    control.Reverse = newItem.Reverse;
-
-                if (datItemFields.Contains(DatItemField.Control_Ways))
-                    control.Ways = newItem.Ways;
-
-                if (datItemFields.Contains(DatItemField.Control_Ways2))
-                    control.Ways2 = newItem.Ways2;
-
-                if (datItemFields.Contains(DatItemField.Control_Ways3))
-                    control.Ways3 = newItem.Ways3;
-            }
-
-            #endregion
-
-            #region DataArea
-
-            else if (datItem is DataArea dataArea)
-            {
-                DataArea newItem = repDatItem as DataArea;
-
-                if (datItemFields.Contains(DatItemField.AreaName))
-                    dataArea.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.AreaSize))
-                    dataArea.Size = newItem.Size;
-
-                if (datItemFields.Contains(DatItemField.AreaWidth))
-                    dataArea.Width = newItem.Width;
-
-                if (datItemFields.Contains(DatItemField.AreaEndianness))
-                    dataArea.Endianness = newItem.Endianness;
-            }
-
-            #endregion
-
-            #region Device
-
-            else if (datItem is Device device)
-            {
-                Device newItem = repDatItem as Device;
-
-                if (datItemFields.Contains(DatItemField.DeviceType))
-                    device.DeviceType = newItem.DeviceType;
-
-                if (datItemFields.Contains(DatItemField.Tag))
-                    device.Tag = newItem.Tag;
-
-                if (datItemFields.Contains(DatItemField.FixedImage))
-                    device.FixedImage = newItem.FixedImage;
-
-                if (datItemFields.Contains(DatItemField.Mandatory))
-                    device.Mandatory = newItem.Mandatory;
-
-                if (datItemFields.Contains(DatItemField.Interface))
-                    device.Interface = newItem.Interface;
-
-                // Instance_* doesn't make sense here
-                // since not every instance under the other item
-                // can replace every instance under this item
-
-                // Extension_* doesn't make sense here
-                // since not every extension under the other item
-                // can replace every extension under this item
-            }
-
-            #endregion
-        
-            #region DipSwitch
-
-            else if (datItem is DipSwitch dipSwitch)
-            {
-                DipSwitch newItem = repDatItem as DipSwitch;
-
-                #region Common
-
-                if (datItemFields.Contains(DatItemField.Tag))
-                    dipSwitch.Tag = newItem.Tag;
-
-                if (datItemFields.Contains(DatItemField.Mask))
-                    dipSwitch.Mask = newItem.Mask;
-
-                // Condition_* doesn't make sense here
-                // since not every condition under the other item
-                // can replace every condition under this item
-
-                // Location_* doesn't make sense here
-                // since not every location under the other item
-                // can replace every location under this item
-
-                // Setting_* doesn't make sense here
-                // since not every value under the other item
-                // can replace every value under this item
-
-                #endregion
-
-                #region SoftwareList
-
-                if (dipSwitch.PartSpecified && newItem.PartSpecified)
-                    ReplaceFields(dipSwitch.Part, newItem.Part, datItemFields);
-
-                #endregion
-            }
-
-            #endregion
-
-            #region Disk
-
-            else if (datItem is Disk disk)
-            {
-                Disk newItem = repDatItem as Disk;
-
-                #region Common
-
-                if (datItemFields.Contains(DatItemField.MD5))
-                {
-                    if (string.IsNullOrEmpty(disk.MD5) && !string.IsNullOrEmpty(newItem.MD5))
-                        disk.MD5 = newItem.MD5;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA1))
-                {
-                    if (string.IsNullOrEmpty(disk.SHA1) && !string.IsNullOrEmpty(newItem.SHA1))
-                        disk.SHA1 = newItem.SHA1;
-                }
-
-                if (datItemFields.Contains(DatItemField.Merge))
-                    disk.MergeTag = newItem.MergeTag;
-
-                if (datItemFields.Contains(DatItemField.Region))
-                    disk.Region = newItem.Region;
-
-                if (datItemFields.Contains(DatItemField.Index))
-                    disk.Index = newItem.Index;
-
-                if (datItemFields.Contains(DatItemField.Writable))
-                    disk.Writable = newItem.Writable;
-
-                if (datItemFields.Contains(DatItemField.Status))
-                    disk.ItemStatus = newItem.ItemStatus;
-
-                if (datItemFields.Contains(DatItemField.Optional))
-                    disk.Optional = newItem.Optional;
-
-                #endregion
-
-                #region SoftwareList
-
-                if (disk.DiskAreaSpecified && newItem.DiskAreaSpecified)
-                    ReplaceFields(disk.DiskArea, newItem.DiskArea, datItemFields);
-
-                if (disk.PartSpecified && newItem.PartSpecified)
-                    ReplaceFields(disk.Part, newItem.Part, datItemFields);
-
-                #endregion
-            }
-
-            #endregion
-
-            #region DiskArea
-
-            else if (datItem is DiskArea diskArea)
-            {
-                DiskArea newItem = repDatItem as DiskArea;
-
-                if (datItemFields.Contains(DatItemField.AreaName))
-                    diskArea.Name = newItem.Name;
-            }
-
-            #endregion
-
-            #region Display
-
-            else if (datItem is Display display)
-            {
-                Display newItem = repDatItem as Display;
-
-                if (datItemFields.Contains(DatItemField.Tag))
-                    display.Tag = newItem.Tag;
-
-                if (datItemFields.Contains(DatItemField.DisplayType))
-                    display.DisplayType = newItem.DisplayType;
-
-                if (datItemFields.Contains(DatItemField.Rotate))
-                    display.Rotate = newItem.Rotate;
-
-                if (datItemFields.Contains(DatItemField.FlipX))
-                    display.FlipX = newItem.FlipX;
-
-                if (datItemFields.Contains(DatItemField.Width))
-                    display.Width = newItem.Width;
-
-                if (datItemFields.Contains(DatItemField.Height))
-                    display.Height = newItem.Height;
-
-                if (datItemFields.Contains(DatItemField.Refresh))
-                    display.Refresh = newItem.Refresh;
-
-                if (datItemFields.Contains(DatItemField.PixClock))
-                    display.PixClock = newItem.PixClock;
-
-                if (datItemFields.Contains(DatItemField.HTotal))
-                    display.HTotal = newItem.HTotal;
-
-                if (datItemFields.Contains(DatItemField.HBEnd))
-                    display.HBEnd = newItem.HBEnd;
-
-                if (datItemFields.Contains(DatItemField.HBStart))
-                    display.HBStart = newItem.HBStart;
-
-                if (datItemFields.Contains(DatItemField.VTotal))
-                    display.VTotal = newItem.VTotal;
-
-                if (datItemFields.Contains(DatItemField.VBEnd))
-                    display.VBEnd = newItem.VBEnd;
-
-                if (datItemFields.Contains(DatItemField.VBStart))
-                    display.VBStart = newItem.VBStart;
-            }
-
-            #endregion
-
-            #region Driver
-
-            else if (datItem is Driver driver)
-            {
-                Driver newItem = repDatItem as Driver;
-
-                if (datItemFields.Contains(DatItemField.SupportStatus))
-                    driver.Status = newItem.Status;
-
-                if (datItemFields.Contains(DatItemField.EmulationStatus))
-                    driver.Emulation = newItem.Emulation;
-
-                if (datItemFields.Contains(DatItemField.CocktailStatus))
-                    driver.Cocktail = newItem.Cocktail;
-
-                if (datItemFields.Contains(DatItemField.SaveStateStatus))
-                    driver.SaveState = newItem.SaveState;
-            }
-
-            #endregion
-
-            #region Extension
-
-            else if (datItem is Extension extension)
-            {
-                Extension newItem = repDatItem as Extension;
-
-                if (datItemFields.Contains(DatItemField.Extension_Name))
-                    extension.Name = newItem.Name;
-            }
-
-            #endregion
-
-            #region Feature
-
-            else if (datItem is Feature feature)
-            {
-                Feature newItem = repDatItem as Feature;
-
-                if (datItemFields.Contains(DatItemField.FeatureType))
-                    feature.Type = newItem.Type;
-
-                if (datItemFields.Contains(DatItemField.FeatureStatus))
-                    feature.Status = newItem.Status;
-
-                if (datItemFields.Contains(DatItemField.FeatureOverall))
-                    feature.Overall = newItem.Overall;
-            }
-
-            #endregion
-
-            #region Info
-
-            else if (datItem is Info info)
-            {
-                Info newItem = repDatItem as Info;
-
-                if (datItemFields.Contains(DatItemField.Value))
-                    info.Value = newItem.Value;
-            }
-
-            #endregion
-
-            #region Input
-
-            else if (datItem is Input input)
-            {
-                Input newItem = repDatItem as Input;
-
-                if (datItemFields.Contains(DatItemField.Service))
-                    input.Service = newItem.Service;
-
-                if (datItemFields.Contains(DatItemField.Tilt))
-                    input.Tilt = newItem.Tilt;
-
-                if (datItemFields.Contains(DatItemField.Players))
-                    input.Players = newItem.Players;
-
-                if (datItemFields.Contains(DatItemField.Coins))
-                    input.Coins = newItem.Coins;
-
-                // Control_* doesn't make sense here
-                // since not every control under the other item
-                // can replace every control under this item
-            }
-
-            #endregion
-
-            #region Instance
-
-            else if (datItem is Instance instance)
-            {
-                Instance newItem = repDatItem as Instance;
-
-                if (datItemFields.Contains(DatItemField.Instance_Name))
-                    instance.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.Instance_BriefName))
-                    instance.BriefName = newItem.BriefName;
-            }
-
-            #endregion
-
-            #region Location
-
-            else if (datItem is Location location)
-            {
-                Location newItem = repDatItem as Location;
-
-                if (datItemFields.Contains(DatItemField.Location_Name))
-                    location.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.Location_Number))
-                    location.Number = newItem.Number;
-
-                if (datItemFields.Contains(DatItemField.Location_Inverted))
-                    location.Inverted = newItem.Inverted;
-            }
-
-            #endregion
-
-            #region Media
-
-            else if (datItem is Media media)
-            {
-                Media newItem = repDatItem as Media;
-
-                if (datItemFields.Contains(DatItemField.MD5))
-                {
-                    if (string.IsNullOrEmpty(media.MD5) && !string.IsNullOrEmpty(newItem.MD5))
-                        media.MD5 = newItem.MD5;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA1))
-                {
-                    if (string.IsNullOrEmpty(media.SHA1) && !string.IsNullOrEmpty(newItem.SHA1))
-                        media.SHA1 = newItem.SHA1;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA256))
-                {
-                    if (string.IsNullOrEmpty(media.SHA256) && !string.IsNullOrEmpty(newItem.SHA256))
-                        media.SHA256 = newItem.SHA256;
-                }
-
-                if (datItemFields.Contains(DatItemField.SpamSum))
-                {
-                    if (string.IsNullOrEmpty(media.SpamSum) && !string.IsNullOrEmpty(newItem.SpamSum))
-                        media.SpamSum = newItem.SpamSum;
-                }
-            }
-
-            #endregion
-
-            #region Part
-
-            else if (datItem is Part part)
-            {
-                Part newItem = repDatItem as Part;
-
-                if (datItemFields.Contains(DatItemField.Part_Name))
-                    part.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.Part_Interface))
-                    part.Interface = newItem.Interface;
-
-                // Part_Feature_* doesn't make sense here
-                // since not every part feature under the other item
-                // can replace every part feature under this item
-            }
-
-            #endregion
-
-            #region PartFeature
-
-            else if (datItem is PartFeature partFeature)
-            {
-                PartFeature newItem = repDatItem as PartFeature;
-
-                if (datItemFields.Contains(DatItemField.Part_Feature_Name))
-                    partFeature.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.Part_Feature_Value))
-                    partFeature.Value = newItem.Value;
-            }
-
-            #endregion
-
-            #region Port
-
-            else if (datItem is Port)
-            {
-                // Analog_* doesn't make sense here
-                // since not every analog under the other item
-                // can replace every analog under this item
-            }
-
-            #endregion
-
-            #region RamOption
-
-            else if (datItem is RamOption ramOption)
-            {
-                RamOption newItem = repDatItem as RamOption;
-
-                if (datItemFields.Contains(DatItemField.Default))
-                    ramOption.Default = newItem.Default;
-
-                if (datItemFields.Contains(DatItemField.Content))
-                    ramOption.Content = newItem.Content;
-            }
-
-            #endregion
-
-            #region Release
-
-            else if (datItem is Release release)
-            {
-                Release newItem = repDatItem as Release;
-
-                if (datItemFields.Contains(DatItemField.Region))
-                    release.Region = newItem.Region;
-
-                if (datItemFields.Contains(DatItemField.Language))
-                    release.Language = newItem.Language;
-
-                if (datItemFields.Contains(DatItemField.Date))
-                    release.Date = newItem.Date;
-
-                if (datItemFields.Contains(DatItemField.Default))
-                    release.Default = newItem.Default;
-            }
-
-            #endregion
-
-            #region Rom
-
-            else if (datItem is Rom rom)
-            {
-                Rom newItem = repDatItem as Rom;
-
-                #region Common
-
-                if (datItemFields.Contains(DatItemField.Bios))
-                    rom.Bios = newItem.Bios;
-
-                if (datItemFields.Contains(DatItemField.Size))
-                    rom.Size = newItem.Size;
-
-                if (datItemFields.Contains(DatItemField.CRC))
-                {
-                    if (string.IsNullOrEmpty(rom.CRC) && !string.IsNullOrEmpty(newItem.CRC))
-                        rom.CRC = newItem.CRC;
-                }
-
-                if (datItemFields.Contains(DatItemField.MD5))
-                {
-                    if (string.IsNullOrEmpty(rom.MD5) && !string.IsNullOrEmpty(newItem.MD5))
-                        rom.MD5 = newItem.MD5;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA1))
-                {
-                    if (string.IsNullOrEmpty(rom.SHA1) && !string.IsNullOrEmpty(newItem.SHA1))
-                        rom.SHA1 = newItem.SHA1;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA256))
-                {
-                    if (string.IsNullOrEmpty(rom.SHA256) && !string.IsNullOrEmpty(newItem.SHA256))
-                        rom.SHA256 = newItem.SHA256;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA384))
-                {
-                    if (string.IsNullOrEmpty(rom.SHA384) && !string.IsNullOrEmpty(newItem.SHA384))
-                        rom.SHA384 = newItem.SHA384;
-                }
-
-                if (datItemFields.Contains(DatItemField.SHA512))
-                {
-                    if (string.IsNullOrEmpty(rom.SHA512) && !string.IsNullOrEmpty(newItem.SHA512))
-                        rom.SHA512 = newItem.SHA512;
-                }
-
-                if (datItemFields.Contains(DatItemField.SpamSum))
-                {
-                    if (string.IsNullOrEmpty(rom.SpamSum) && !string.IsNullOrEmpty(newItem.SpamSum))
-                        rom.SpamSum = newItem.SpamSum;
-                }
-
-                if (datItemFields.Contains(DatItemField.Merge))
-                    rom.MergeTag = newItem.MergeTag;
-
-                if (datItemFields.Contains(DatItemField.Region))
-                    rom.Region = newItem.Region;
-
-                if (datItemFields.Contains(DatItemField.Offset))
-                    rom.Offset = newItem.Offset;
-
-                if (datItemFields.Contains(DatItemField.Date))
-                    rom.Date = newItem.Date;
-
-                if (datItemFields.Contains(DatItemField.Status))
-                    rom.ItemStatus = newItem.ItemStatus;
-
-                if (datItemFields.Contains(DatItemField.Optional))
-                    rom.Optional = newItem.Optional;
-
-                if (datItemFields.Contains(DatItemField.Inverted))
-                    rom.Inverted = newItem.Inverted;
-
-                #endregion
-
-                #region AttractMode
-
-                if (datItemFields.Contains(DatItemField.AltName))
-                    rom.AltName = newItem.AltName;
-
-                if (datItemFields.Contains(DatItemField.AltTitle))
-                    rom.AltTitle = newItem.AltTitle;
-
-                #endregion
-
-                #region OpenMSX
-
-                if (datItemFields.Contains(DatItemField.Original))
-                    rom.Original = newItem.Original;
-
-                if (datItemFields.Contains(DatItemField.OpenMSXSubType))
-                    rom.OpenMSXSubType = newItem.OpenMSXSubType;
-
-                if (datItemFields.Contains(DatItemField.OpenMSXType))
-                    rom.OpenMSXType = newItem.OpenMSXType;
-
-                if (datItemFields.Contains(DatItemField.Remark))
-                    rom.Remark = newItem.Remark;
-
-                if (datItemFields.Contains(DatItemField.Boot))
-                    rom.Boot = newItem.Boot;
-
-                #endregion
-
-                #region SoftwareList
-
-                if (datItemFields.Contains(DatItemField.LoadFlag))
-                    rom.LoadFlag = newItem.LoadFlag;
-
-                if (datItemFields.Contains(DatItemField.Value))
-                    rom.Value = newItem.Value;
-
-                if (rom.DataAreaSpecified && newItem.DataAreaSpecified)
-                    ReplaceFields(rom.DataArea, newItem.DataArea, datItemFields);
-
-                if (rom.PartSpecified && newItem.PartSpecified)
-                    ReplaceFields(rom.Part, newItem.Part, datItemFields);
-
-                #endregion
-            }
-
-            #endregion
-
-            #region Setting
-
-            else if (datItem is Setting setting)
-            {
-                Setting newItem = repDatItem as Setting;
-
-                if (datItemFields.Contains(DatItemField.Setting_Name))
-                    setting.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.Setting_Value))
-                    setting.Value = newItem.Value;
-
-                if (datItemFields.Contains(DatItemField.Setting_Default))
-                    setting.Default = newItem.Default;
-
-                // Condition_* doesn't make sense here
-                // since not every condition under the other item
-                // can replace every condition under this item
-            }
-
-            #endregion
-
-            #region SharedFeature
-
-            else if (datItem is SharedFeature sharedFeature)
-            {
-                SharedFeature newItem = repDatItem as SharedFeature;
-
-                if (datItemFields.Contains(DatItemField.Value))
-                    sharedFeature.Value = newItem.Value;
-            }
-
-            #endregion
-
-            #region Slot
-
-            else if (datItem is Slot)
-            {
-                // SlotOption_* doesn't make sense here
-                // since not every slot option under the other item
-                // can replace every slot option under this item
-            }
-
-            #endregion
-
-            #region SlotOption
-
-            else if (datItem is SlotOption slotOption)
-            {
-                SlotOption newItem = repDatItem as SlotOption;
-
-                if (datItemFields.Contains(DatItemField.SlotOption_Name))
-                    slotOption.Name = newItem.Name;
-
-                if (datItemFields.Contains(DatItemField.SlotOption_DeviceName))
-                    slotOption.DeviceName = newItem.DeviceName;
-
-                if (datItemFields.Contains(DatItemField.SlotOption_Default))
-                    slotOption.Default = newItem.Default;
-            }
-
-            #endregion
-
-            #region SoftwareList
-
-            else if (datItem is SoftwareList softwareList)
-            {
-                SoftwareList newItem = repDatItem as SoftwareList;
-
-                if (datItemFields.Contains(DatItemField.SoftwareListStatus))
-                    softwareList.Status = newItem.Status;
-
-                if (datItemFields.Contains(DatItemField.Filter))
-                    softwareList.Filter = newItem.Filter;
-            }
-
-            #endregion
-
-            #region Sound
-
-            else if (datItem is Sound sound)
-            {
-                Sound newItem = repDatItem as Sound;
-
-                if (datItemFields.Contains(DatItemField.Channels))
-                    sound.Channels = newItem.Channels;
-            }
+            #region Item-Specific
+
+            if (datItem is Adjuster) ReplaceFields(datItem as Adjuster, repDatItem as Adjuster, datItemFields);
+            else if (datItem is Analog) ReplaceFields(datItem as Analog, repDatItem as Analog, datItemFields);
+            else if (datItem is BiosSet) ReplaceFields(datItem as BiosSet, repDatItem as BiosSet, datItemFields);
+            else if (datItem is Chip) ReplaceFields(datItem as Chip, repDatItem as Chip, datItemFields);
+            else if (datItem is Condition) ReplaceFields(datItem as Condition, repDatItem as Condition, datItemFields);
+            else if (datItem is Configuration) ReplaceFields(datItem as Configuration, repDatItem as Configuration, datItemFields);
+            else if (datItem is Control) ReplaceFields(datItem as Control, repDatItem as Control, datItemFields);
+            else if (datItem is DataArea) ReplaceFields(datItem as DataArea, repDatItem as DataArea, datItemFields);
+            else if (datItem is Device) ReplaceFields(datItem as Device, repDatItem as Device, datItemFields);
+            else if (datItem is DipSwitch) ReplaceFields(datItem as DipSwitch, repDatItem as DipSwitch, datItemFields);
+            else if (datItem is Disk) ReplaceFields(datItem as Disk, repDatItem as Disk, datItemFields);
+            else if (datItem is DiskArea) ReplaceFields(datItem as DiskArea, repDatItem as DiskArea, datItemFields);
+            else if (datItem is Display) ReplaceFields(datItem as Display, repDatItem as Display, datItemFields);
+            else if (datItem is Driver) ReplaceFields(datItem as Driver, repDatItem as Driver, datItemFields);
+            else if (datItem is Extension) ReplaceFields(datItem as Extension, repDatItem as Extension, datItemFields);
+            else if (datItem is Feature) ReplaceFields(datItem as Feature, repDatItem as Feature, datItemFields);
+            else if (datItem is Info) ReplaceFields(datItem as Info, repDatItem as Info, datItemFields);
+            else if (datItem is Input) ReplaceFields(datItem as Input, repDatItem as Input, datItemFields);
+            else if (datItem is Instance) ReplaceFields(datItem as Instance, repDatItem as Instance, datItemFields);
+            else if (datItem is Location) ReplaceFields(datItem as Location, repDatItem as Location, datItemFields);
+            else if (datItem is Media) ReplaceFields(datItem as Media, repDatItem as Media, datItemFields);
+            else if (datItem is Part) ReplaceFields(datItem as Part, repDatItem as Part, datItemFields);
+            else if (datItem is PartFeature) ReplaceFields(datItem as PartFeature, repDatItem as PartFeature, datItemFields);
+            else if (datItem is Port) ReplaceFields(datItem as Port, repDatItem as Port, datItemFields);
+            else if (datItem is RamOption) ReplaceFields(datItem as RamOption, repDatItem as RamOption, datItemFields);
+            else if (datItem is Release) ReplaceFields(datItem as Release, repDatItem as Release, datItemFields);
+            else if (datItem is Rom) ReplaceFields(datItem as Rom, repDatItem as Rom, datItemFields);
+            else if (datItem is Setting) ReplaceFields(datItem as Setting, repDatItem as Setting, datItemFields);
+            else if (datItem is SharedFeature) ReplaceFields(datItem as SharedFeature, repDatItem as SharedFeature, datItemFields);
+            else if (datItem is Slot) ReplaceFields(datItem as Slot, repDatItem as Slot, datItemFields);
+            else if (datItem is SlotOption) ReplaceFields(datItem as SlotOption, repDatItem as SlotOption, datItemFields);
+            else if (datItem is SoftwareList) ReplaceFields(datItem as SoftwareList, repDatItem as SoftwareList, datItemFields);
+            else if (datItem is Sound) ReplaceFields(datItem as Sound, repDatItem as Sound, datItemFields);
 
             #endregion
         }
@@ -1005,6 +224,838 @@ namespace SabreTools.DatItems
             #endregion
         }
 
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="adjuster">Adjuster to remove replace fields in</param>
+        /// <param name="newItem">Adjuster to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Adjuster adjuster, Adjuster newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Default))
+                adjuster.Default = newItem.Default;
+
+            // Condition_* doesn't make sense here
+            // since not every condition under the other item
+            // can replace every condition under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="analog">Analog to remove replace fields in</param>
+        /// <param name="newItem">Analog to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Analog analog, Analog newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Analog_Mask))
+                analog.Mask = newItem.Mask;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="biosSet">BiosSet to remove replace fields in</param>
+        /// <param name="newItem">BiosSet to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(BiosSet biosSet, BiosSet newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Description))
+                biosSet.Description = newItem.Description;
+
+            if (datItemFields.Contains(DatItemField.Default))
+                biosSet.Default = newItem.Default;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="chip">Chip to remove replace fields in</param>
+        /// <param name="newItem">Chip to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Chip chip, Chip newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Tag))
+                chip.Tag = newItem.Tag;
+
+            if (datItemFields.Contains(DatItemField.ChipType))
+                chip.ChipType = newItem.ChipType;
+
+            if (datItemFields.Contains(DatItemField.Clock))
+                chip.Clock = newItem.Clock;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="condition">Condition to remove replace fields in</param>
+        /// <param name="newItem">Condition to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Condition condition, Condition newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Tag))
+                condition.Tag = newItem.Tag;
+            else if (datItemFields.Contains(DatItemField.Condition_Tag))
+                condition.Tag = newItem.Tag;
+
+            if (datItemFields.Contains(DatItemField.Mask))
+                condition.Mask = newItem.Mask;
+            else if (datItemFields.Contains(DatItemField.Condition_Mask))
+                condition.Mask = newItem.Mask;
+
+            if (datItemFields.Contains(DatItemField.Relation))
+                condition.Relation = newItem.Relation;
+            else if (datItemFields.Contains(DatItemField.Condition_Relation))
+                condition.Relation = newItem.Relation;
+
+            if (datItemFields.Contains(DatItemField.Value))
+                condition.Value = newItem.Value;
+            else if (datItemFields.Contains(DatItemField.Condition_Value))
+                condition.Value = newItem.Value;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="configuration">Configuration to remove replace fields in</param>
+        /// <param name="newItem">Configuration to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Configuration configuration, Configuration newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Tag))
+                configuration.Tag = newItem.Tag;
+
+            if (datItemFields.Contains(DatItemField.Mask))
+                configuration.Mask = newItem.Mask;
+
+            // Condition_* doesn't make sense here
+            // since not every condition under the other item
+            // can replace every condition under this item
+
+            // Location_* doesn't make sense here
+            // since not every location under the other item
+            // can replace every location under this item
+
+            // Setting_* doesn't make sense here
+            // since not every setting under the other item
+            // can replace every setting under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="control">Control to remove replace fields in</param>
+        /// <param name="newItem">Control to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Control control, Control newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Control_Type))
+                control.ControlType = newItem.ControlType;
+
+            if (datItemFields.Contains(DatItemField.Control_Player))
+                control.Player = newItem.Player;
+
+            if (datItemFields.Contains(DatItemField.Control_Buttons))
+                control.Buttons = newItem.Buttons;
+
+            if (datItemFields.Contains(DatItemField.Control_RequiredButtons))
+                control.RequiredButtons = newItem.RequiredButtons;
+
+            if (datItemFields.Contains(DatItemField.Control_Minimum))
+                control.Minimum = newItem.Minimum;
+
+            if (datItemFields.Contains(DatItemField.Control_Maximum))
+                control.Maximum = newItem.Maximum;
+
+            if (datItemFields.Contains(DatItemField.Control_Sensitivity))
+                control.Sensitivity = newItem.Sensitivity;
+
+            if (datItemFields.Contains(DatItemField.Control_KeyDelta))
+                control.KeyDelta = newItem.KeyDelta;
+
+            if (datItemFields.Contains(DatItemField.Control_Reverse))
+                control.Reverse = newItem.Reverse;
+
+            if (datItemFields.Contains(DatItemField.Control_Ways))
+                control.Ways = newItem.Ways;
+
+            if (datItemFields.Contains(DatItemField.Control_Ways2))
+                control.Ways2 = newItem.Ways2;
+
+            if (datItemFields.Contains(DatItemField.Control_Ways3))
+                control.Ways3 = newItem.Ways3;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="dataArea">DataArea to remove replace fields in</param>
+        /// <param name="newItem">DataArea to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(DataArea dataArea, DataArea newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.AreaName))
+                dataArea.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.AreaSize))
+                dataArea.Size = newItem.Size;
+
+            if (datItemFields.Contains(DatItemField.AreaWidth))
+                dataArea.Width = newItem.Width;
+
+            if (datItemFields.Contains(DatItemField.AreaEndianness))
+                dataArea.Endianness = newItem.Endianness;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="device">Device to remove replace fields in</param>
+        /// <param name="newItem">Device to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Device device, Device newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.DeviceType))
+                device.DeviceType = newItem.DeviceType;
+
+            if (datItemFields.Contains(DatItemField.Tag))
+                device.Tag = newItem.Tag;
+
+            if (datItemFields.Contains(DatItemField.FixedImage))
+                device.FixedImage = newItem.FixedImage;
+
+            if (datItemFields.Contains(DatItemField.Mandatory))
+                device.Mandatory = newItem.Mandatory;
+
+            if (datItemFields.Contains(DatItemField.Interface))
+                device.Interface = newItem.Interface;
+
+            // Instance_* doesn't make sense here
+            // since not every instance under the other item
+            // can replace every instance under this item
+
+            // Extension_* doesn't make sense here
+            // since not every extension under the other item
+            // can replace every extension under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="dipSwitch">DipSwitch to remove replace fields in</param>
+        /// <param name="newItem">DipSwitch to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(DipSwitch dipSwitch, DipSwitch newItem, List<DatItemField> datItemFields)
+        {
+            #region Common
+
+            if (datItemFields.Contains(DatItemField.Tag))
+                dipSwitch.Tag = newItem.Tag;
+
+            if (datItemFields.Contains(DatItemField.Mask))
+                dipSwitch.Mask = newItem.Mask;
+
+            // Condition_* doesn't make sense here
+            // since not every condition under the other item
+            // can replace every condition under this item
+
+            // Location_* doesn't make sense here
+            // since not every location under the other item
+            // can replace every location under this item
+
+            // Setting_* doesn't make sense here
+            // since not every value under the other item
+            // can replace every value under this item
+
+            #endregion
+
+            #region SoftwareList
+
+            if (dipSwitch.PartSpecified && newItem.PartSpecified)
+                ReplaceFields(dipSwitch.Part, newItem.Part, datItemFields);
+
+            #endregion
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="disk">Disk to remove replace fields in</param>
+        /// <param name="newItem">Disk to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Disk disk, Disk newItem, List<DatItemField> datItemFields)
+        {
+            #region Common
+
+            if (datItemFields.Contains(DatItemField.MD5))
+            {
+                if (string.IsNullOrEmpty(disk.MD5) && !string.IsNullOrEmpty(newItem.MD5))
+                    disk.MD5 = newItem.MD5;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA1))
+            {
+                if (string.IsNullOrEmpty(disk.SHA1) && !string.IsNullOrEmpty(newItem.SHA1))
+                    disk.SHA1 = newItem.SHA1;
+            }
+
+            if (datItemFields.Contains(DatItemField.Merge))
+                disk.MergeTag = newItem.MergeTag;
+
+            if (datItemFields.Contains(DatItemField.Region))
+                disk.Region = newItem.Region;
+
+            if (datItemFields.Contains(DatItemField.Index))
+                disk.Index = newItem.Index;
+
+            if (datItemFields.Contains(DatItemField.Writable))
+                disk.Writable = newItem.Writable;
+
+            if (datItemFields.Contains(DatItemField.Status))
+                disk.ItemStatus = newItem.ItemStatus;
+
+            if (datItemFields.Contains(DatItemField.Optional))
+                disk.Optional = newItem.Optional;
+
+            #endregion
+
+            #region SoftwareList
+
+            if (disk.DiskAreaSpecified && newItem.DiskAreaSpecified)
+                ReplaceFields(disk.DiskArea, newItem.DiskArea, datItemFields);
+
+            if (disk.PartSpecified && newItem.PartSpecified)
+                ReplaceFields(disk.Part, newItem.Part, datItemFields);
+
+            #endregion
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="diskArea">DiskArea to remove replace fields in</param>
+        /// <param name="newItem">DiskArea to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(DiskArea diskArea, DiskArea newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.AreaName))
+                diskArea.Name = newItem.Name;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="display">Display to remove replace fields in</param>
+        /// <param name="newItem">Display to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Display display, Display newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Tag))
+                display.Tag = newItem.Tag;
+
+            if (datItemFields.Contains(DatItemField.DisplayType))
+                display.DisplayType = newItem.DisplayType;
+
+            if (datItemFields.Contains(DatItemField.Rotate))
+                display.Rotate = newItem.Rotate;
+
+            if (datItemFields.Contains(DatItemField.FlipX))
+                display.FlipX = newItem.FlipX;
+
+            if (datItemFields.Contains(DatItemField.Width))
+                display.Width = newItem.Width;
+
+            if (datItemFields.Contains(DatItemField.Height))
+                display.Height = newItem.Height;
+
+            if (datItemFields.Contains(DatItemField.Refresh))
+                display.Refresh = newItem.Refresh;
+
+            if (datItemFields.Contains(DatItemField.PixClock))
+                display.PixClock = newItem.PixClock;
+
+            if (datItemFields.Contains(DatItemField.HTotal))
+                display.HTotal = newItem.HTotal;
+
+            if (datItemFields.Contains(DatItemField.HBEnd))
+                display.HBEnd = newItem.HBEnd;
+
+            if (datItemFields.Contains(DatItemField.HBStart))
+                display.HBStart = newItem.HBStart;
+
+            if (datItemFields.Contains(DatItemField.VTotal))
+                display.VTotal = newItem.VTotal;
+
+            if (datItemFields.Contains(DatItemField.VBEnd))
+                display.VBEnd = newItem.VBEnd;
+
+            if (datItemFields.Contains(DatItemField.VBStart))
+                display.VBStart = newItem.VBStart;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="driver">Driver to remove replace fields in</param>
+        /// <param name="newItem">Driver to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Driver driver, Driver newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.SupportStatus))
+                driver.Status = newItem.Status;
+
+            if (datItemFields.Contains(DatItemField.EmulationStatus))
+                driver.Emulation = newItem.Emulation;
+
+            if (datItemFields.Contains(DatItemField.CocktailStatus))
+                driver.Cocktail = newItem.Cocktail;
+
+            if (datItemFields.Contains(DatItemField.SaveStateStatus))
+                driver.SaveState = newItem.SaveState;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="extension">Extension to remove replace fields in</param>
+        /// <param name="newItem">Extension to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Extension extension, Extension newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Extension_Name))
+                extension.Name = newItem.Name;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="feature">Feature to remove replace fields in</param>
+        /// <param name="newItem">Feature to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Feature feature, Feature newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.FeatureType))
+                feature.Type = newItem.Type;
+
+            if (datItemFields.Contains(DatItemField.FeatureStatus))
+                feature.Status = newItem.Status;
+
+            if (datItemFields.Contains(DatItemField.FeatureOverall))
+                feature.Overall = newItem.Overall;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="info">Info to remove replace fields in</param>
+        /// <param name="newItem">Info to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Info info, Info newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Value))
+                info.Value = newItem.Value;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="input">Input to remove replace fields in</param>
+        /// <param name="newItem">Input to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Input input, Input newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Service))
+                input.Service = newItem.Service;
+
+            if (datItemFields.Contains(DatItemField.Tilt))
+                input.Tilt = newItem.Tilt;
+
+            if (datItemFields.Contains(DatItemField.Players))
+                input.Players = newItem.Players;
+
+            if (datItemFields.Contains(DatItemField.Coins))
+                input.Coins = newItem.Coins;
+
+            // Control_* doesn't make sense here
+            // since not every control under the other item
+            // can replace every control under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="instance">Instance to remove replace fields in</param>
+        /// <param name="newItem">Instance to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Instance instance, Instance newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Instance_Name))
+                instance.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.Instance_BriefName))
+                instance.BriefName = newItem.BriefName;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="location">Location to remove replace fields in</param>
+        /// <param name="newItem">Location to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Location location, Location newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Location_Name))
+                location.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.Location_Number))
+                location.Number = newItem.Number;
+
+            if (datItemFields.Contains(DatItemField.Location_Inverted))
+                location.Inverted = newItem.Inverted;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="media">Media to remove replace fields in</param>
+        /// <param name="newItem">Media to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Media media, Media newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.MD5))
+            {
+                if (string.IsNullOrEmpty(media.MD5) && !string.IsNullOrEmpty(newItem.MD5))
+                    media.MD5 = newItem.MD5;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA1))
+            {
+                if (string.IsNullOrEmpty(media.SHA1) && !string.IsNullOrEmpty(newItem.SHA1))
+                    media.SHA1 = newItem.SHA1;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA256))
+            {
+                if (string.IsNullOrEmpty(media.SHA256) && !string.IsNullOrEmpty(newItem.SHA256))
+                    media.SHA256 = newItem.SHA256;
+            }
+
+            if (datItemFields.Contains(DatItemField.SpamSum))
+            {
+                if (string.IsNullOrEmpty(media.SpamSum) && !string.IsNullOrEmpty(newItem.SpamSum))
+                    media.SpamSum = newItem.SpamSum;
+            }
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="part">Part to remove replace fields in</param>
+        /// <param name="newItem">Part to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Part part, Part newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Part_Name))
+                part.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.Part_Interface))
+                part.Interface = newItem.Interface;
+
+            // Part_Feature_* doesn't make sense here
+            // since not every part feature under the other item
+            // can replace every part feature under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="partFeature">PartFeature to remove replace fields in</param>
+        /// <param name="newItem">PartFeature to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(PartFeature partFeature, PartFeature newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Part_Feature_Name))
+                partFeature.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.Part_Feature_Value))
+                partFeature.Value = newItem.Value;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="port">Port to remove replace fields in</param>
+        /// <param name="newItem">Port to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Port port, Port newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Tag))
+                port.Tag = newItem.Tag;
+
+            // Analog_* doesn't make sense here
+            // since not every analog under the other item
+            // can replace every analog under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="ramOption">RamOption to remove replace fields in</param>
+        /// <param name="newItem">RamOption to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(RamOption ramOption, RamOption newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Default))
+                ramOption.Default = newItem.Default;
+
+            if (datItemFields.Contains(DatItemField.Content))
+                ramOption.Content = newItem.Content;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="release">Release to remove replace fields in</param>
+        /// <param name="newItem">Release to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Release release, Release newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Region))
+                release.Region = newItem.Region;
+
+            if (datItemFields.Contains(DatItemField.Language))
+                release.Language = newItem.Language;
+
+            if (datItemFields.Contains(DatItemField.Date))
+                release.Date = newItem.Date;
+
+            if (datItemFields.Contains(DatItemField.Default))
+                release.Default = newItem.Default;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="rom">Rom to remove replace fields in</param>
+        /// <param name="newItem">Rom to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Rom rom, Rom newItem, List<DatItemField> datItemFields)
+        {
+            #region Common
+
+            if (datItemFields.Contains(DatItemField.Bios))
+                rom.Bios = newItem.Bios;
+
+            if (datItemFields.Contains(DatItemField.Size))
+                rom.Size = newItem.Size;
+
+            if (datItemFields.Contains(DatItemField.CRC))
+            {
+                if (string.IsNullOrEmpty(rom.CRC) && !string.IsNullOrEmpty(newItem.CRC))
+                    rom.CRC = newItem.CRC;
+            }
+
+            if (datItemFields.Contains(DatItemField.MD5))
+            {
+                if (string.IsNullOrEmpty(rom.MD5) && !string.IsNullOrEmpty(newItem.MD5))
+                    rom.MD5 = newItem.MD5;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA1))
+            {
+                if (string.IsNullOrEmpty(rom.SHA1) && !string.IsNullOrEmpty(newItem.SHA1))
+                    rom.SHA1 = newItem.SHA1;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA256))
+            {
+                if (string.IsNullOrEmpty(rom.SHA256) && !string.IsNullOrEmpty(newItem.SHA256))
+                    rom.SHA256 = newItem.SHA256;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA384))
+            {
+                if (string.IsNullOrEmpty(rom.SHA384) && !string.IsNullOrEmpty(newItem.SHA384))
+                    rom.SHA384 = newItem.SHA384;
+            }
+
+            if (datItemFields.Contains(DatItemField.SHA512))
+            {
+                if (string.IsNullOrEmpty(rom.SHA512) && !string.IsNullOrEmpty(newItem.SHA512))
+                    rom.SHA512 = newItem.SHA512;
+            }
+
+            if (datItemFields.Contains(DatItemField.SpamSum))
+            {
+                if (string.IsNullOrEmpty(rom.SpamSum) && !string.IsNullOrEmpty(newItem.SpamSum))
+                    rom.SpamSum = newItem.SpamSum;
+            }
+
+            if (datItemFields.Contains(DatItemField.Merge))
+                rom.MergeTag = newItem.MergeTag;
+
+            if (datItemFields.Contains(DatItemField.Region))
+                rom.Region = newItem.Region;
+
+            if (datItemFields.Contains(DatItemField.Offset))
+                rom.Offset = newItem.Offset;
+
+            if (datItemFields.Contains(DatItemField.Date))
+                rom.Date = newItem.Date;
+
+            if (datItemFields.Contains(DatItemField.Status))
+                rom.ItemStatus = newItem.ItemStatus;
+
+            if (datItemFields.Contains(DatItemField.Optional))
+                rom.Optional = newItem.Optional;
+
+            if (datItemFields.Contains(DatItemField.Inverted))
+                rom.Inverted = newItem.Inverted;
+
+            #endregion
+
+            #region AttractMode
+
+            if (datItemFields.Contains(DatItemField.AltName))
+                rom.AltName = newItem.AltName;
+
+            if (datItemFields.Contains(DatItemField.AltTitle))
+                rom.AltTitle = newItem.AltTitle;
+
+            #endregion
+
+            #region OpenMSX
+
+            if (datItemFields.Contains(DatItemField.Original))
+                rom.Original = newItem.Original;
+
+            if (datItemFields.Contains(DatItemField.OpenMSXSubType))
+                rom.OpenMSXSubType = newItem.OpenMSXSubType;
+
+            if (datItemFields.Contains(DatItemField.OpenMSXType))
+                rom.OpenMSXType = newItem.OpenMSXType;
+
+            if (datItemFields.Contains(DatItemField.Remark))
+                rom.Remark = newItem.Remark;
+
+            if (datItemFields.Contains(DatItemField.Boot))
+                rom.Boot = newItem.Boot;
+
+            #endregion
+
+            #region SoftwareList
+
+            if (datItemFields.Contains(DatItemField.LoadFlag))
+                rom.LoadFlag = newItem.LoadFlag;
+
+            if (datItemFields.Contains(DatItemField.Value))
+                rom.Value = newItem.Value;
+
+            if (rom.DataAreaSpecified && newItem.DataAreaSpecified)
+                ReplaceFields(rom.DataArea, newItem.DataArea, datItemFields);
+
+            if (rom.PartSpecified && newItem.PartSpecified)
+                ReplaceFields(rom.Part, newItem.Part, datItemFields);
+
+            #endregion
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="setting">Setting to remove replace fields in</param>
+        /// <param name="newItem">Setting to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Setting setting, Setting newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Setting_Name))
+                setting.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.Setting_Value))
+                setting.Value = newItem.Value;
+
+            if (datItemFields.Contains(DatItemField.Setting_Default))
+                setting.Default = newItem.Default;
+
+            // Condition_* doesn't make sense here
+            // since not every condition under the other item
+            // can replace every condition under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="sharedFeature">SharedFeature to remove replace fields in</param>
+        /// <param name="newItem">SharedFeature to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(SharedFeature sharedFeature, SharedFeature newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Value))
+                sharedFeature.Value = newItem.Value;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="slot">Slot to remove replace fields in</param>
+        /// <param name="newItem">Slot to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Slot slot, Slot newItem, List<DatItemField> datItemFields)
+        {
+            // SlotOption_* doesn't make sense here
+            // since not every slot option under the other item
+            // can replace every slot option under this item
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="slotOption">SlotOption to remove replace fields in</param>
+        /// <param name="newItem">SlotOption to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(SlotOption slotOption, SlotOption newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.SlotOption_Name))
+                slotOption.Name = newItem.Name;
+
+            if (datItemFields.Contains(DatItemField.SlotOption_DeviceName))
+                slotOption.DeviceName = newItem.DeviceName;
+
+            if (datItemFields.Contains(DatItemField.SlotOption_Default))
+                slotOption.Default = newItem.Default;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="softwareList">SoftwareList to remove replace fields in</param>
+        /// <param name="newItem">SoftwareList to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(SoftwareList softwareList, SoftwareList newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.SoftwareListStatus))
+                softwareList.Status = newItem.Status;
+
+            if (datItemFields.Contains(DatItemField.Filter))
+                softwareList.Filter = newItem.Filter;
+        }
+
+        /// <summary>
+        /// Replace fields with given values
+        /// </summary>
+        /// <param name="sound">Sound to remove replace fields in</param>
+        /// <param name="newItem">Sound to pull new information from</param>
+        /// <param name="datItemFields">List of fields representing what should be updated</param>
+        private static void ReplaceFields(Sound sound, Sound newItem, List<DatItemField> datItemFields)
+        {
+            if (datItemFields.Contains(DatItemField.Channels))
+                sound.Channels = newItem.Channels;
+        }
+
+        #endregion
+
+        #region Field Setting
+
         /// <summary>
         /// Set fields with given values
         /// </summary>
@@ -1956,6 +2007,8 @@ namespace SabreTools.DatItems
             #endregion
         }
     
+        #endregion
+
         /// <summary>
         /// Set internal names to match One Rom Per Game (ORPG) logic
         /// </summary>
diff --git a/SabreTools.Filtering/Cleaner.cs b/SabreTools.Filtering/Cleaner.cs
index 53323129..7d5ba136 100644
--- a/SabreTools.Filtering/Cleaner.cs
+++ b/SabreTools.Filtering/Cleaner.cs
@@ -15,7 +15,6 @@ namespace SabreTools.Filtering
     /// <summary>
     /// Represents the cleaning operations that need to be performed on a set of items, usually a DAT
     /// </summary>
-    /// TODO: Split out helper classes
     public class Cleaner
     {
         #region Exclusion Fields