To assign a VC class to a base profile for a dynamic ATM 1483 subinterface, you can use the atm class-vc command from Profile Configuration mode. Issuing this command applies the set of attributes in the specified VC class to all bulk-configured VC ranges that are dynamically created from this profile.
For more information, see Configuring ATM 1483 Dynamic Subinterfaces in Configuring Dynamic Interfaces Using Bulk Configuration.