i am using vlookup in an invoice situation

i have my products columns set up as - sku / description / price

i use the sku to pull over the description and price to the invoice

i would like to add another column which would be an alternate sku number
and then on the invoice - we could enter either the sku number or alt sku number and have them bring over the info

here is the formula i am using now with just the one sku column

=IF(ISBLANK(B11),"",VLOOKUP(B11,Products,3,FALSE))

Thanks fr any help and or suggestions