One technique that “sometimes” works, at least on simpler documents. Use this utility to copy the data provider first … Copy Data Providers / Copy Report Variables. From the “source” report, do a Save As…, and change the file type to template (*.ret). Now on the “destination” report, go to Format, Report, Apply Template… Cross your fingers, and test thoroughly!
Dwayne Hoffpauir 
(BOB member since 2002-09-19)