In the Add Custom Property dialog box, type a Custom property name and Value for the custom field. (to match the name in the Fields dialog box) and give it the value 2015.02 to reflect the project number of the current drawing. You'll now see an entry in the Custom Properties list that matches the custom field you've just created.
In the drawing that contains the title block Xref, type in the Command line and press Enter) for the fields to display properly.
TY Hello, I have a background that it is constantly being upgraded due to changes this drawing is being xref into the MEP working dwgs.
TY Hi For starters have a browse of the following threads (and all links found within)... XREF files not Updating Xref Titleblock - Xref visretain set to 0 and another Xref set to 1 Linetype Problem Have a good one, Mike No, only when you open your working dwg the xref is updated.
For example, you can change the color, visibility, linetype, and other properties of xref layers with the Auto CAD VISRETAIN system variable.