Excel - Sum cells down until identifier

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I'm not too sure if this is possible in an excel formula or if I will need to write VBA to make this happen, but essentially I want the '?' cells to sum all the cells below it until it reaches another Header in Column A. Right now I have the basics of the =IF formula looking like this:

=IF(OFFSET(INDIRECT(ADDRESS(ROW(), COLUMN())),0,-1) ISBLANK, null, SUMIF())

But I am stuck on the sum portion. Right now the formula is looking 1 cell to the left; seeing if blank, then do nothing or if not blank (header) then it needs to sum all cells below until it reaches another header.

A very weird question but hopefully what i'm asking is making sense. Any thoughts would be appreciated. Thanks.

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excel-formula vba excel
1 Answers

In cell B2, enter formula :

=SUM(B3:B$18)-SUMIF(A3:A$18,"<>",B3:B$18)*2

Edited

or ,

=SUM(OFFSET(B3,,,MATCH(1,FREQUENCY(1,N(A3:A$18<>"")),0)-1))

then, copied and pasted to B6, B15, and B17

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