When using a shortcut part in SR3D, it doesn't add the shortcut part, it adds all the parts in the shortcut. Personally, I find that quite annoying, because when opening it in another editor or software (such as lpub), you end up with all the loose parts...
I don't know if it's approapiate here, but you can select subparts in a shortcut part by holding shift and selecting a piece in the shortcut.
I don't know if it's approapiate here, but you can select subparts in a shortcut part by holding shift and selecting a piece in the shortcut.