hi artj, so when u refer to Sheet 2, i assume u mean the 2nd workbook u uploaded? try this in A4 of the 2nd workbook:
=INDEX('[original part numbers.xlsx]Sheet1'!$A$8:$A$22,MATCH(C4,'[original part numbers.xlsx]Sheet1'!$C$8:$C$22,0))
if it's a totally new product not in the old list, do u do it manually then? if u want in to continue in sequence, u may try:
=IF(ISNA(INDEX('[original part numbers.xlsx]Sheet1'!$A$8:$A$22,MATCH(C4,'[original part numbers.xlsx]Sheet1'!$C$8:$C$22,0))),MAX($A$3:A3)+1,INDEX('[original part numbers.xlsx]Sheet1'!$A$8:$A$22,MATCH(C4,'[original part numbers.xlsx]Sheet1'!$C$8:$C$22,0)))
let me know if it works
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