Got the new ui flow working and the models updated. Need to get changes written to the database.

OpenArchival.DataAccess/Models/ModelHelpers.cs

@@ -0,0 +1,11 @@
+namespace OpenArchival.DataAccess;
+
+public class ModelHelpers
+{
+    public static string? MakeIdentifier(List<string>? values, string fieldSeperator, string? archiveEntryNumber)
+    {
+        if (values is null || values.Count == 0) return null;
+
+        return (archiveEntryNumber is not null) ? $"{string.Join(fieldSeperator, values)}{archiveEntryNumber}" : string.Join(fieldSeperator, values);
+    }
+}