The word you're looking for is "children," as in the child objects parented/attached to the root node of your model. You grab child objects using the child commands like GetChild and FindChild. The former is more useful if you don't know anything about the model (use CountChildren and loop through to the one you want) while the latter is more useful if you know a lot about the model (since you can attach a handle straight to the child you want based on object name.)