I am currently using the following formula:

=SUMPRODUCT(--(ISNUMBER(FIND("SPGM",'7-14-07'!$E$2:$E$65535))),--
(ISNUMBER('7-14-07'!$Y$2:$Y$65535)),--('7-14-07'!$Y$2:$Y$65535<=$F$3))

this sumproduct matches product codes from work sheet 7-14-07 column
E:E that have the following formats:

2060207-SPGM021
2060207-SPGM022
2060207-SPGM023
2060207-SPGM024
2060207-SPGM025
2060207-SPGM026
2060207-SPGM027

For these product codes it works fine the problem comes in when I need
to match the following product codes;

2060207-SP021
2060207-SP022
2060207-SP023
2060207-SP024
2060207-SP025
2060207-SP026
2060207-SP027

The first 7 digits of the product code are always the same but the
alpha can be 1,2,3,4,5,or 6 characters in length which are always
followed by a three digit number that ranges from 001 thru 999.

The problem is when you sumproduct a "SP" as in the example directly
above but this returns the sum of all "SP" and "SPM" which is where my
problem lies. The remaining part of the formula functions properly
matching dates that are <= F3. I use this to provide all the different
product codes that have been scheduled for production prior to and
including the last day of the month. Any assistance would be greatly
appreciated!