Is there a way to synchronize assemblies and parts so that if you make a change to a part it updates in the assembly or vice versa?
This functionality is not currently available. Each design is self contained with no external references. It is possible to Insert one design into another; however, this is a copy of with no link link to the original. Subsequent updates will not be reflected once the copy has been made.
You may Vote on the below Idea to raise the priority of this enhancement request to the Product Management team. Work on this item is in progress at this time.
http://forums.autodesk.com/t5/Fusion-360-IdeaStation-Request-a/linked-cad-files/idi-p/4876988
Let me know if you have any other questions.
Thanks,