BALS concentration question

[ARhead]

My current "active program" is BALS. I was thinking of doing the social sciences concentration. Would I have to contact the school to add the BALS in social sciences to my active programs list? Or are all the concentrations automatically possible through the BA.LIBST, and it's just a matter of gathering the right courses?

Also, how many Active Programs can one have at any given time? I'd just like to lock the 2019A-2020 calendar in for a few different programs (if possible) instead of wishing I had in hindsight if my goals change in the future. (like a BA history for instance)

I mean, I don't know what the general consensus is on concentrations and if their in any way necessary. I just thought I might as well do the social science because I'll definitely be able to fulfill those requirements with the types of courses I like to take.

Thanks.