In the V3 workbook, you have TOTAL (m1 to m3) between M3 and M4, so if you choose M4, M5 or M6, that total will be included in the SUM calculated by the first part of the formula. The
part of the formula checks if the selected M# is M4- M6 and subtracts out TOTAL (m1 to m3). If you choose M7 - M12 the first part of the formula calculates a sum that includes both TOTAL (m1 to m3) and TOTAL (m1 to m6), so the second part
checks if M > 6, if so it adds the two totals
and subtracts them so that they are not double added.
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