diff --git a/SabreTools.Library/DatFiles/AttractMode.cs b/SabreTools.Library/DatFiles/AttractMode.cs
index 5847120c..bdc6dfa2 100644
--- a/SabreTools.Library/DatFiles/AttractMode.cs
+++ b/SabreTools.Library/DatFiles/AttractMode.cs
@@ -29,12 +29,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public AttractMode(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/ClrMamePro.cs b/SabreTools.Library/DatFiles/ClrMamePro.cs
index 232c618a..fdb3367f 100644
--- a/SabreTools.Library/DatFiles/ClrMamePro.cs
+++ b/SabreTools.Library/DatFiles/ClrMamePro.cs
@@ -30,12 +30,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public ClrMamePro(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/DatFile.cs b/SabreTools.Library/DatFiles/DatFile.cs
index bdee9a56..c327a9b0 100644
--- a/SabreTools.Library/DatFiles/DatFile.cs
+++ b/SabreTools.Library/DatFiles/DatFile.cs
@@ -1557,9 +1557,21 @@ namespace SabreTools.Library.DatFiles
 		/// Create a new DatFile from an existing one using the header values only
 		/// </summary>
 		/// <param name="df"></param>
-		public DatFile(DatFile datFile)
+		/// <param name="cloneHeader">True if only the header should be cloned (default), false if this should be a reference to another DatFile</param>
+		public DatFile(DatFile datFile, bool cloneHeader = true)
 		{
-			_datHeader = (DatHeader)datFile._datHeader.Clone();
+			if (cloneHeader)
+			{
+				this._datHeader = (DatHeader)datFile._datHeader.Clone();
+			}
+			else
+			{
+				this._datHeader = datFile._datHeader;
+				this._items = datFile._items;
+				this._sortedBy = datFile._sortedBy;
+				this._mergedBy = datFile._mergedBy;
+				this._datStats = datFile._datStats;
+			}
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/DosCenter.cs b/SabreTools.Library/DatFiles/DosCenter.cs
index 43ec7c7b..d98a9b85 100644
--- a/SabreTools.Library/DatFiles/DosCenter.cs
+++ b/SabreTools.Library/DatFiles/DosCenter.cs
@@ -29,12 +29,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public DosCenter(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/Hashfile.cs b/SabreTools.Library/DatFiles/Hashfile.cs
index ecf98116..6ea613c3 100644
--- a/SabreTools.Library/DatFiles/Hashfile.cs
+++ b/SabreTools.Library/DatFiles/Hashfile.cs
@@ -33,12 +33,8 @@ namespace SabreTools.Library.DatFiles
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		/// <param name="hash">Type of hash that is associated with this DAT</param> 
 		public Hashfile(DatFile datFile, Hash hash)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 			_hash = hash;
 		}
 
diff --git a/SabreTools.Library/DatFiles/Listroms.cs b/SabreTools.Library/DatFiles/Listroms.cs
index ea56ba2a..e619d6f8 100644
--- a/SabreTools.Library/DatFiles/Listroms.cs
+++ b/SabreTools.Library/DatFiles/Listroms.cs
@@ -30,12 +30,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public Listroms(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/Logiqx.cs b/SabreTools.Library/DatFiles/Logiqx.cs
index 4d49aec3..111f1943 100644
--- a/SabreTools.Library/DatFiles/Logiqx.cs
+++ b/SabreTools.Library/DatFiles/Logiqx.cs
@@ -32,12 +32,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public Logiqx(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/Missfile.cs b/SabreTools.Library/DatFiles/Missfile.cs
index 9a218265..f913d17e 100644
--- a/SabreTools.Library/DatFiles/Missfile.cs
+++ b/SabreTools.Library/DatFiles/Missfile.cs
@@ -28,12 +28,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public Missfile(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/OfflineList.cs b/SabreTools.Library/DatFiles/OfflineList.cs
index 7bb0064e..15ab4b79 100644
--- a/SabreTools.Library/DatFiles/OfflineList.cs
+++ b/SabreTools.Library/DatFiles/OfflineList.cs
@@ -29,12 +29,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public OfflineList(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/RomCenter.cs b/SabreTools.Library/DatFiles/RomCenter.cs
index f625f66f..25d60e8e 100644
--- a/SabreTools.Library/DatFiles/RomCenter.cs
+++ b/SabreTools.Library/DatFiles/RomCenter.cs
@@ -30,12 +30,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public RomCenter(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/SabreDat.cs b/SabreTools.Library/DatFiles/SabreDat.cs
index 1eb8b41b..044b7053 100644
--- a/SabreTools.Library/DatFiles/SabreDat.cs
+++ b/SabreTools.Library/DatFiles/SabreDat.cs
@@ -30,12 +30,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public SabreDat(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>
diff --git a/SabreTools.Library/DatFiles/SeparatedValue.cs b/SabreTools.Library/DatFiles/SeparatedValue.cs
index cd919ff0..b097f04b 100644
--- a/SabreTools.Library/DatFiles/SeparatedValue.cs
+++ b/SabreTools.Library/DatFiles/SeparatedValue.cs
@@ -32,12 +32,8 @@ namespace SabreTools.Library.DatFiles
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		/// <param name="delim">Delimiter for parsing individual lines</param>
 		public SeparatedValue(DatFile datFile, char delim)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 			_delim = delim;
 		}
 
diff --git a/SabreTools.Library/DatFiles/SoftwareList.cs b/SabreTools.Library/DatFiles/SoftwareList.cs
index 7f447e11..a494b0be 100644
--- a/SabreTools.Library/DatFiles/SoftwareList.cs
+++ b/SabreTools.Library/DatFiles/SoftwareList.cs
@@ -29,12 +29,8 @@ namespace SabreTools.Library.DatFiles
 		/// </summary>
 		/// <param name="datFile">Parent DatFile to copy from</param>
 		public SoftwareList(DatFile datFile)
+			: base(datFile, cloneHeader: false)
 		{
-			this._datHeader = datFile._datHeader;
-			this._items = datFile._items;
-			this._sortedBy = datFile._sortedBy;
-			this._mergedBy = datFile._mergedBy;
-			this._datStats = datFile._datStats;
 		}
 
 		/// <summary>