Depends on what your formulas are.
This may help (or not):
Insert a couple of worksheets to surround your existing worksheets.
Call the one at the far Left, "Start" (w/o the quotes).
Call the one at the far right, "End" (w/o the quotes).
Then put the total sheet outside that "sandwich" of worksheets.
And use a formula like:
=sum(Start:End!g9)
You can drag sheets in and out of that sandwich to play what-if games.
And you can insert new sheets within that sandwich, too.