It's not clear which sheet(s) the data entry is done on. Assuming it's done on the 'Calculations' sheet, see attached. I had to modify that sheet's layout to give August the same layout as the other months, but the result is that the individual monthly data can be derived using a single formula on each of the monthly sheets, and the quarterly data can likewise be derived using a single formula for any month.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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