I'm not sure I understand exactly what you are trying to do, though I suspect there isn't a handy tool to do it and you will need to do a bit of work on your own. Are you trying to turn your class into a class group, or switch it from class group A to class group B? What is the driver behind this? Do you want the data in a different database table? Are all your exposed columns available in the new class group? I suspect that is really the thing that will drive the conversation most.