Here:
BAQ Report Parameter - Help Needed - ERP 10 - Epicor User Help Forum (epiusers.help)
This link is the parent of the previous link:
BAQ Report Parameter - Help Needed - ERP 10 - Epicor User Help Forum (epiusers.help)
Note that @cfinley didn’t use BAQ report designer. In other words, I don’t think what you are trying to do is possible through BAQ report designer, but I could be completely wrong. I don’t have a ton of expertise in this area as it pertains to BAQs with params.