You can remove a linked drawing from the electrical project database as long as all of the circuits in the drawing have been removed. When you unlink a drawing from the electrical project database, the next time you save the drawing, the data from that drawing is automatically removed from the electrical project database.
To unlink a drawing from the electrical project database
The drawing and its electrical data are removed from the electrical project database. You can reload the electrical project database in any linked drawings that are open.