Need help creating a somewhat odd Excel formula

Question

I'm trying to create a formula that takes C2-B2 and uses the result to determine which cells to add together. So if the result is 2 it takes AA2 and AB2, adds them together, and displays the result. In other words, it counts cells stemming from a point and adds them, with the amount counted determined by the result of two other cells.

Answer 1

This doesnt sound recursive the way you describe it.

Put this formula somewhere on the sheet and see if this is what you want:

=SUM($AA$2:INDEX($AA$2:$XFD$2, 1, SUM($B$2:$C$2)))