You're a genius! I've been trying to get the suggestion from ExcelForm to work all evening and it just hasn't been working.
Ok so this is an example of one of the formulas:
=MAX((INDEX(FlakeLength,$AH2-1):INDEX(FlakeLength,$AI2-1)))
I noticed that you have split the data range info in my spreadsheet into two columns, and I see how that plugs into the above formula, but how does the formula know that this data range info relates to the 'Master Data' tab?
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