Modular Assemblies

[GearsintheSky]

I'm new to KSP (Starting in 2). I did the tutorials for building and specifically for this issues the subassembly tutorial. I have a successful spacecraft that will orbit so naturally I want to build a space station. So I built a cargo "pod" to attach to my spacecraft (it's just cargo space with a small fuel tank, engine, and 2 SRBs.) When I attempt to attach it to my main spacecraft the only snap it has is in the cargobay. So now my Spacecraft is stored inside the cargo area. How do I attach the cargocraft to the outside of my spacecraft?

[The Aziz]

Some pictures would be nice to see the problem. Normally there should be no problems with adding to the stack, although you may want to change the root/anchor part on the vessel you're trying to attach so that you're holding it by the part that connects to the other subassembly.