Class-Specific Discount Codes

We'd like to offer master classes as CLASSES (not events) so we can specify ages and add descriptions of the class, etc. We'd like to offer various discounts to these classes - discounts that are ONLY applicable to the master classes (discounts to targeted demographics like a geographic area, or students at a private school or partner institution, or for folks who see and advertisement). It would be great to have the option, when registering for a class, to add a promotional code for a discount for THAT CLASS ONLY. Thanks!