I have a sheet that I use to track monthly sales. Each month I insert a new row into row 7 and enter that month's sales. I have a formula in row 4 =SUM(H7:H18) that totals the previous 12 months. When I insert the new row, the formula changes to =SUM(H8:H19). Is there a way to lock the formula so that it will always reference rows 7 to 18? I've tried using a $ in front of the 7 & 18 but that doesn't work.
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