Maybe this ; =IF(OR(A1=1,A1=2),vlookup,"")
This is just a example : =IF(OR(A1=1,A1=2),VLOOKUP(B1,C112,2,FALSE),"")
You don't say what you want if no match, so I put "", this will leave the cell
blank.
If you put double quotes around your numbers, it will tell excel that those
numbers are text, not numbers.
HTH
John