SW explorer.
open assembly,select copy, copy children, find where used. You find a multi page drawing that has drawing view derived from the assembly and drawing views derived from individual parts in the assembly. You copy this assembly to a new folder including all children with a new suffix like "rev 2".
When you open the copied version of the drawing any views that were created from parts are still looking at the original parts requiring you to rename the original folder and refind the newly copied parts one by one as you open the drawing.
bleh!