Hi, thanks
Nearly there. I tried this and it seems to be failing at the end of the Indirect calculation. I had to add in an extra Oct[Dates] as the rest of the sumif references broke.
=SUMIFS(INDIRECT("Oct["&[@Server]&"]),Oct[Dates]"),Oct[Dates],">="&[From],Oct[Dates],"<="&[To])
attached Capture 1 shows it is finding the reference but then it fails to #REF on next step (capture 2)
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any thoughts?