i am completely new to IA, but created my first setup in a few minutes - IA is very impressive

But i have a problem:
I need the same file in more features (not all). How should I include this kind of files so they are packed only once in setup.exe (=smaller).
One additional question:
How does Competitive Upgrade work (I'm using Wise InstallMaster 8.x)?
Do i have to send the serial number?
Thank you very much.
Josef