Problem when copying whole contents of a drawing to another drawing

I'm trying to merge two schematics together using the copy/paste function and am having some issues.  After pasting, the copied objects don't carry over their wire numbers/connector identifiers, they duplicate the wire numbers/connector identifiers of the original drawing on the page, in the original locations.  I tried to fix this by consolidating the layers on each drawing, then naming them separately, 998 & 999, but I still have the problem.  Thanks in advance!

Adam