Have you looked at the example "solarsystem.vi" in the LabVIEW Example Finder? This shows how to place a sun, earth and moon in relation to each other and move them around.
I believe it should be in LV 8.6 as well, if not let me know and I will try to downconvert it to you. Basically what you want to do is to use the 3D transformation VI's under "Grahics and sound" -> "3D picture control" -> "Transformations". It allows you to move (translate), change size (scale), and change rotation (rotate) your 3D objects.