for each workbook, I will need the:
workbook name
sheet name
range, i.e. A1:AR7
so I will know how to reference it into the formula.
example:
VLOOKUP($A1,[Home.xlsx]Sheet1!A1:AR100,1,FALSE)
THE REAL FORMULA I AM CREATING LOOKS SOMETHING LIKE THIS:
IF(ISNA(VLOOKUP($A1,[Home.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE))
IF(ISNA(VLOOKUP($A1,[Billing.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE)),IF(ISNA(VLOOKUP($A1,[Work.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE)),IF(ISNA(VLOOKUP($A1,[POBox.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE)),VLOOKUP($A1,[POBox.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE),"NO
MATCH ANYWHERE"),VLOOKUP($A1,[Work.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE)),VLOOKUP($A1,[Billing.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE)),VLOOKUP($A1,[Home.xlsx]Sheet1!THE ENTIRE RANGE,1,FALSE))