It's a function which accepts anything as an argument, so you can use it anywhere in Sheets 1-3, with any part number.
Can we be clear on the definition though - at the moment, it counts the number of occurrences of a part number, and divides that by the number of sheets in which that part number was found.
That's not % of fleet, that's parts per aircraft which used that part.
For % of fleet, try the following:
This counts the number of sheets on which the part WAS used, and divides it by the total number of sheets which exist (-3, to ignore your template sheets). I guess I'm assuming that you have one worksheet per aircraft.
Use as
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