So I have sales data by month for many years in a row. I want to consolidate 3 months at a time to get a quarterly sales basis... So I want to sum Jan, Feb, March and then April, May, June... etc.
The data is across a single row, A1=Jan'00 B1=Feb'00 C1=Mar'00.
Way down on the end of this row (at the end of 2012) I want to sum 3 cells at a time quickly to show quarterly basis for each year.
Can anybody come up with a way to do this?
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