Place this formula in your worksheet 2:
=IF(ISERROR(VLOOKUP(A1,Sheet1!$A$1:$B$3,2,FALSE)),"No
Match",VLOOKUP(A1,Sheet1!$A$1:$B$3,2,FALSE))
Note that I am using the defaul Sheet names, Sheet1 and Sheet2, also I
placed your data in Columns A and B rows 1 through 3 on both worksheets. The
$ signs ensures that when you copy the formula from one cell to the next you
get a constant table array. Modify as necessary, but your data should look
something like what you originally had except for the formula above where you
Worksheet 1 Month 1 Worksheet 2 Month 2
Col A Col B Col A Col B
Acct # Journal Acct# Acct # Journal Acct#
12345 67890 34872 Formula
34872 28730 89732 Formula
38458 91087 12345 Formula
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Regards,
Michael Arch.