Not sure if I'm missing a setting somewhere or not, but is there a way to prevent adding a listing in a parent category? For instance, let's say my parent category was Sandwiches. Under that category, I might have Peanut Butter and Jelly, Grilled Cheese, and Ham and Cheese. I only want my users to be able to sell those three sandwiches. Well, if they come in and try selling a Club, they'll just put it in the parent. I don't want any listings inside the parent. Make sense? Now, I'm not selling sandwiches, just an arbitrary example.