Even better snb, thanks for your suggestion.
I'm using the following now (ADV sheets are a special case that need a bit extra info, and slightly amended formula to SUM):
-edit: The workbook will consist of 1 of the following 7 combinations of sheets:
"Invoice" and "Completes"
"Invoice" and "Aborts"
"Invoice" and ...
"Invoice" and ...
"Invoice" and ...
"Invoice" and ...
"Invoice" and ...
So the formula is only entered once on "Invoice" to sum the backing data.
Again, many thanks both for your help.
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