I am trying to get Excel to "know" which cell a formula is in and then count
a certain number of rows and columns to find where the data that needs to be
used in the calculation is.

For example if I have data that needs to be used in the calculation in C2:C6
and the formula is in B7, I need Excel to count one column to the right and 4
rows above from B7 to find the data and work out the result of the formula.

I can do the part about counting the rows and columns, but I can't find how
to get Excel to work out the cell reference for the formula cell. Is this
possible and how?