Voldoverse

Hello all, I specialize in only fixing airbag control units, i am looking at buying GCT but i see so many different things in store that i get confused, can someone that knows the GCT tool help me figure out what exactly I need to buy in store to only be able to program on airbag control module and only calculate clear files for airbag modules please? i do not nee function for Immo, ODO and ECU, only airbag for me