To save a model and all of its assets:
The model and its constraint are selected.
 
                  Branch selected in the Scene browser A. Old Car model B. Old Car’s associated assets
The saving procedure is identical to selecting File > Save As. See Saving assets to an .fbx file.
 Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
 Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License