You can't manipulate with 3d objects in Goblin editor.It is just a sort of preview app, but you can change or assign new controllers or reposition damage zones on objects and some other things. It's a long process but it can be done, if you are persistent.
For 3d manipulation we had a TDW editor(GR2EditorViewer).It is a TDW masterpiece with great potencial but unfortunatelly in current state, it is very limited and somehow buggy. And you can't use it on 64bit system.
Good luck.