If you download and install the free Morefunc.dll addin from this site: http://xcell05.free.fr/english/
You can implement the THREED() function which allows manipulation of multiple sheets.
You must have a list of part numbers in your summary sheet first.... so if these part numbers are in column A of your summary sheet and in your other sheets and column B contains the quantities... then try something like:
Where Sheet1:Sheet3 is the range of sheet names to consider and A1:B100 contain the part information in each sheet.
the A1 represents the first part number in your summary sheet to count.
Note: This is an array formula and once entered/adjusted must be confirmed with CTRL+SHIFT+ENTER keys not just ENTER...you will see { } brackets appear around the formula.... then you can copy it down the list.
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