Use a helper column with a formula. Assuming key in column A on Sheet1 and
Sheet2, then use

=IF(COUNTIF(Sheet1!A:A,A1)0,"Duplicate","")

and copy down

--

HTH

RP
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"genoq" wrote in message
...
I have a workbook with 2 spreadsheets, each with containing a list of part
numbers. On the second spreadsheet, I want to compare lists and identify
duplicates from the first list, without changing the sorted order of
either
list. What is the easiest way to flag these duplicates on sheet 2