Utilizing pre-made gears in a gearbox

[ekapalka]

I'm starting to design a gearbox in Inventor, and I guess I've run into a problem. Instead of using the design accelerator to make the gears, I would prefer to use gears that already exist that would be difficult to create on my own (such as dog gears or spoked gears). Is it possible to take pre-existing gear models and constrain them together like the ones output by the design accelerator (i.e with movement constraints)? If that's not possible, how would I go about properly distancing gears from one another to at least make it appear right?