I've got a dilemma with an Excel sheet. I have made several sheets which can
lookup from a master parts list (different worksheet in same workbook) for a
description, list price, and my cost based on the input of a part number.
Now I have one manufacturer who has over 100,000 part numbers. I have
combined their lists into one workbook, with 3 sheets of data. I want to
know if I can build a formula that will look at the first sheet, if it's not
found, look at the second sheet, and if it's not found look at the last
sheet, and return me the data I'm looking for.

I assume this is going to be a huge nested formula involving VLOOKUP and
ISNA, but I just can't put together the command in my head. Can anyone help?

If this works, my next challenge is to look up the same part number in
multiple sheets and return the lowest price. Any help with that would be
appreciated too.