Since you have a database which keeps expanding (assumption) then it is best to create first some dynamic named ranges so that you references can remain dynamic.
So first create a named range for each of the Actual, Budget and Forecast sheets.
e.g use the same name as the sheetnames, you can use a name: Actual and apply formula:
for Budget:
and for Forecast:
then in Summary sheet, D6 use formula:
copied down and across.. then replace Actual with Budget and Forecast, respectively in column E and F.
in Summary, L6 use:
copied down and across.. then replace Actual with Budget and Forecast, respectively in column M and N.
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