Hi there,
This situation is just crying out for a Defined Name Formula 
I'll assume that you want to implement the formula:
A5: Code input to get Cell A5=B5+A4
Proceed as follows:
Select Cell A5
Select Formulas >> Define Name from the Ribbon
In the New Name DialogBox:
enter frmRunningTotal in the Name box
select the name of the current worksheet from the dropdown list in the Scope combobox
enter =B5 + A4 in the Refers to box (note that these references are RELATIVE, and should NOT be entered as e.g. $B$5)
click on OK
click on Close
Now enter "=
frmRunningTotal" (without quotes) in Cell A5, and the sum of Cells B5 and A4 will be displayed.
What's so special about the above approach? It's that now you can enter =frmRunningTotal in ANY cell on the worksheet, and the result displayed will be the sum of the cell above and the cell on the right of the cell in which the formula has been entered.
Hope this helps - please let me know how you get on.
Regards,
Greg M
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