Does anyone know how to use variable's to set a range in Excel (Not in code
but actually in cells).

For instance I have a cell that does the following Sum(C8:H8) - Clearly this
sums the information in C8:H8. This represents a January - June data. I have
a million of these "sums" throughout my document and I want to be able to
change it so instead of a looking at 6 months, I could look at 3, 9, or
12...etc

My goal is to have two fields where the user could put the first and second
cell in.
Start
End

I would then put that in the formula (ie. Sum(Variable1: Variable2)), with
the variable representing the actual cell location

Can this be done?