I do this quite often. After you copy your drawing in project manager, right click on the new drawing in project manager and select properties, drawing properties. If you are using sheet values for your components and references and wire numbering then change the sheet value and the drawing value at the bottom of the "drawing settings dialog tab (using your own internal drawing numbering sceem) and this will retag your components and wire numbers for you. Again, this only will work if you have formatted your components and wire numbers to use the %D and %S values. They can be configured in the drawing properties dialog box under the component tab and the wire numbers tab.
It's been a while since I have had to do this so I am not sure if you will have to run the retag components comand or not afterwards.
Ronald Michaud
Electrical Engineer
Darly Custom Technology Inc.
www.darlytech.com
Via Lite V3 thru ACADE 2011