Took formulas this far. Adapt for remaining columns.
I inserted duplicate Sample sheet for comparison.
First formula entered in A2 filled down and across to column D.Adapt the INDEX ranges and the MOD arguments for the remaining columns.
Second formula generates repeating years. Enter in E2 and fill down.
Third formula grabs the sales. In F2 and fill down.
I didn't fill the formulas all the way down. The file would be too large to upload. The range is preselected in the saved file. You should just be able to press and hold Ctrl while hitting D (the keyboard shortcut for fill down.) The formulas will copy down.
The workbook is attached.
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