Importing and instansiating fbx models at run time.

As far as I have searched, Asset Bundles are made in unity editor and are then uploaded to a online service. What if I want to import fbx models instead of Asset bundles from a online service. Is there any way to do that?

According to my thinking, unity editor imports the fbx ( by running some script to read model file from local storage.) Can we use the same script to import models from online service on run time. If yes, where can I find that script or even a document explaining the procedure.

 

+1. I would love this too.