One way ..

In Sheet1,

Put in C2:
=SUMPRODUCT((Sheet2!$A$2:$A$10=A2)*(Sheet2!$B$2:$B $10=B2))
Copy down

Adapt the ranges to suit, but note that entire col refs (A:A, B:B, etc)
cannot be used in SUMPRODUCT
--
Max
Singapore
http://savefile.com/projects/236895
xdemechanik
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"tammy" wrote in message
...
Hi I am new to excel and am trying to learn how to count line values from
another worksheet

Worksheet one
PO No Invoice No Line per order
901 1001 3
902 1002 0
903 1003 0

Worksheet two
Po No Inv no part no
901 1001 33mo333
901 1001 44mo444
901 1001 55mo555