If the value to be returned is a date and the part will only appear once:

=SUMIF(Sheet2!A1:A100,L1,Sheet2!B1:B100)

Format as Date

A result of 0 means either the part is not present or the part is present
but there is no date for that part.

--
Biff
Microsoft Excel MVP


"SBW" wrote in message
...
Is there a function I can use to ....

- Check if Sheet 1 L1 value is listed anywhere in Sheet 2 Col A. If true,
then return the corresponding value from Sheet 2 Col B into the
corresponding
cell in Sheet 1 Col M.

Sheet 1:
A....K L M
1 Part 1
2 Part 2
3 Part 3 4/16/2009

Sheet 2:
A B
1 Part 3 4/16/2009
2 Part 4
3 Part 5 4/17/2009