I assume that you mean there are two possible data ranges, only one of which
will have the look-up data in it.
=if(iserror(vlookup(lookup-value,Sheet1!range1,col,False)),vlookup(lookup-value,Sheet2!range2,col,False),vlookup(lookup-value,Sheet1!range1,col,False))

"mikeclimb" wrote:

Having problems with using VLOOKUP when trying to use a range from two
worksheets, how is this done?