Begin in the PetExec menu-->Group Training-->Maintain Group Training Requests. From this screen you have the following options:
When you click "Process", the Assign Pets to Class page displays information about the class itself as well as the requesting pet and pets already assigned to the Group Training.
Click the ‘Schedule Training for Selected Pets’ button near the ‘Related Pets’ heading to assign the pets to the Group Training class.
When pets are scheduled for training the product/service for that class will be added to the pet owner's cart. You have the option to "automatically go to checkout" if you are collecting payment at the time you are adding the pets to the class. If not, the group training service will be in the owners cart and available for checkout at a later time.