I have a 'Master' spreadsheet with a specific reference (Master!H12) and want to return a value from different a specific column in multiple spreadsheets (i.e 'F10'B:B,'M40'!B:B), and calculating to sum where the specific reference is duplicated.
So far I've got the following formula but it calculates only a single instance from a single spreadsheet.
=if(ERROR(INDEX(('F10'!F:F),MATCH(Master!H12,'F10'!B:B,0)),"")
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