Sadly, SUMPRODUCT does not support 3D referencing. You can quickly do a
search in XL help file to find what formulas do.

Sorry I wasn't more helpful.
--
Best Regards,

Luke M
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"Paul" wrote:

I have a collection of worksheets, each with the same format of report, and a
summary sheet which shows the name of each worksheet.

I want to create a selection sheet, where I can mark each of the required
sheets and have the selection sheet show the summed data.

I have tried :
=sumproduct(SheetA:SheetZ!C10,SheetA:SheetZ!$A$1), but it returns a #REF error
(A1 in each sheet holds a 1 if the sheet is required to be included.)
(C10, plus a number of other cells, holds the relevant data on each worksheet)

Any help would be appreciated