Hi Ant. You're now reaching the extent of my limited knowledge of scenery design. I know very little about ATC as I never use it BUT I have successfully added AI traffic to my test airstrip.

You should be able to import your airport into AFCAD. You need to add the gates, ramps & taxyways for the AI traffic to use. Providing it has a control tower & you define the traffic tracks properly in TTools it should work.
Read the instructions with AFCAD & TTools carefully to find out how it's done. This is the best advice I can give you. Good luck.
