If Index/Match is asking Smartsheet to "Insert value1 from Sheet B into A, where Value 2 on Sheet B matches Value 2 on Sheet A"
Is there a way to ask Smartsheet to "Insert Yes if Value 2 on Sheet B matches Value 2 on Sheet A".
So instead of inserting the indexed value, it is inserting a newly generated value you want only on the current spreadsheet.
Or maybe another way to phrase it is - can you make a condition based only on a match in a reference sheet, without indexing the values from that reference sheet?
Hope that is not too confusing!