In my enthusiasm, I purchased and installed both DT and DTPro (and have two DT tabs on the right side of my screen). I am gathering that I do not need or want both running. Do I just delete DT? If so, how do I transfer databases from DT to DTPro?

I would suggest you contact support. You can probably get a refund for DT if you also purchased DTP. They can also help you uninstall the one so that you don’t have both running.