EaZy DuZ iT

Hey guys i just recieved SCT XCAl2 for my car im so eager to put it to use that i wanna do it right now. Say if i use it right now but in a week or two i buy something, not a huge mod, like a egr delete, or thermostat or a iac restrictor could i use the same SCT file, or i have to make a new one, because i think there are 3 tunes allowed right? i want to kno as soon as i use one does it get locked or i can always add mroe to it and use it.. Hope this makes sense. THANKS!