Maybe I am not understanding... or being clear...if you hit F4, it
changes a reference from "C3" to "$C$3" turning it into a relative
reference...for future knowledge that means it wont have that issue of
when you move the formula the referenced cells will change...and can
you use find/replace for changing the months....

If I am still not getting it...try pasting a formula...and show me the
prob that way