[Zope] Best way to have special objects in my products produc list?

I'm making a product that is going to have sub products that doesn't make sense anywhere else. These subproducts should therefore not appear in normal folders. There seems to be several ways to achievie this, what do YOU think are the best way, and why? I'm still using Zope 2.3.4, and I'm subclassing a ZCatalog, and therefore using the standard ObjectManager. Any input appreciated.