Cool! Composite tables helped. I was able to create one report using composite tables. I don't think they really get mentioned in the manual. I didn't know what they were and so I never selected one of them.
Anyway, I'm in the midst of rewriting a lot of our Reportmaster reports using GridView. I have a feeling composite tables won't be the solution for all of my reports, but this definitely helps. I'll post the fields and tables if I get stuck with a report. Thanks for the offer to possibly create specific custom tables.

So far, I love GridView!

Thanks again!

Andre