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Jerry Derfler
 
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Default Copy formula to every 12th cell

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