=IF(ISNA(VLOOKUP(C1,$A$1:$A$31667,1,FALSE)),"NO","YES")
I have part numbers in both column A and Column C. I'm trying to find out which part numbers in column C are new or if they already exist in Column A
Above is my formula but it will only do one cell at a time. if I try and copy and paste, it says something about the size and it will only put a yes or no in one cell. Either I'm doing something wrong or there is a different formula that will put a yes or no in all cells in cloumn B
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