Binding to a nested container?

Hi guys got a l'il problem I need some advice on. I am currently going through the process of binding several Macs to a Test AD environment but have run into an annoying issue. We don't use the AD Container "Computers" for binding machines to the domain. Instead we have a Container called "Test Computers" within which is 3 folders: Desktops, Laptops & Macs. No I can get the Macs to bind to the domain & create themselves in Test Computers, but not Test Computers\Macs... Any ideas?