C1, copied down:

=IF(TEXT(A1,"mmm")="Dec",SUM(OFFSET(B1,,,-12)),"")

Hope this helps!

Jerry Derfler Wrote:
In Excel I have months and years in column A. (several hundred rows)
In Column B I have data.
I want to sum 12months of data in every 12th cell in Column C.
My forumuls is =sum(B1.B12)
How can I copy this formula down column C so I only have results
showing in
every 12th cell and all the 11 cells between each formula is blank.

I prefer a non-macro solution.

Thanks in advance

Jerry




a
a of figures in col. B. I


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