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  • Paul H
    Paul H ✭✭✭✭✭✭
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    Add Month# text column enter 1 though 12, you can hide this column if you want.

    =SUMIFS([Sale Net Revenue]:[Sale Net Revenue], [Month#]:[Month#], <[Month#]@row, [Month#]:[Month#], >=([Month#]@row - 3))

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