Running autopay by class not group. Merged

My fall season had two starts. two classes in August and the rest in September. I need to run autopay for just these two class but cant without making a Parent Group. The class IS the group. Its furstating having to either make a new group called a parent group or charge each parents one at a time. Its also frustrating that slecting parents through sutopay when I am familiar with the child name and their last name is often differnet from their parent makes selections tedious.