G'day,
I've applied the vlookup formula.
It's wrap in a IF and ISNA formula. The IF formula is for if there no product no. it will return blank, and the IF(ISNA() formula so if the product not in the list of that month is return a zero or no sales.
Hope this helps
Edit: Driving home in the car and I was thinking. The formula supplied will only work on the first entry of the product code. If multiple entry of a product in one month use a sumif formula
Example for the Jan Sales. Place in C3 on the sheet 4 and copy down
=SUMIF('SALES JAN 08'!$A$2:$A$1000,A3,'SALES JAN 08'!$C$2:$C$1000)
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