Don't know if this will help but maybe you could use something like
this:

=VLOOKUP(A1,Sheet2!$A$1:$B$100,2,0)-SUMIF($A$1:$A$100,A1,$B$1:$B$100)
where A1 is the part number, A1:B100 is the range of your records in
sheet 1, sheet2!A1:B100 is your inventory (column A-part number, column
B-number of items in stock)
VLOOKUP(A1,Sheet2!$A$1:$A$100,2,0) would find the number of items
originally in stock -
SUMIF($A$1:$A$100,A1,$B$1:$B$100)
will calculate how many items were distributed in your distribution
records (in this case A1:B100 of sheet 1) for the specified part.

HTH
JG


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