The ADD command creates a new scheduling class.

    The class scheduler provides the ability to limit the amount
    of CPU time that a system's users receive by placing users in
    scheduling classes. Each class is assigned a percentage of the
    overall system CPU time. As the system runs, the combined set of
    users in a class is limited to the percentage of CPU execution
    time allocated to their class.

    Users might get some additional CPU time if the qualifier
    /WINDFALL is enabled for their scheduling class. Enabling the
    qualifier /WINDFALL allows the system to give a small amount
    of CPU time to a scheduling class when the scheduling class's
    allotted time has been depleted, but a free CPU is available.

    Format

      CLASS_SCHEDULE ADD  class_name