Have a formula in a crystal report (works fine) that is the following:

If InStr({OEOrdDetailwHead__ao93a171.Description}, 'ML') > 0 then 'Yes ML' else

If InStr({OEOrdDetailwHead__ao93a171.Description}, 'L') > 0 then 'Yes L'

else

'OVER OR UNDER??'

The above formula separates items into their respective groups based where they fall.

How do I incorporate this into a parameter so that I can run the report only to show one of the results?

Thanks in advance.