Wellllll..... You can, sorta. The fields tab is the place where custom screens appear -- like duplicates of the ones all the way on the right if you chose to give the the tab a "tab Name" in the custom screen properties dialog. If no tab name, (only a Screen name) no screen appears in that group to the right after the Standard tabs. And you CAN move around the Fields tab with the ROTabItems1 .ini setting. That said, you can create RecordTypes Rules and have the custom screen you created appear anywhere in the tabs list based on your "Rule based" customizations...If you are using v.6.6 or higher..
Hope that all made sense!
"You cannot hold a torch to another man's path without brightening your own"
Best regards,
Bill