There have been various workflows for many years on how to export a Revit model into a Fabrication DesignLine. You can check out this link to see a reference specific to 2016.
https://www.cadlinecommunity.co.uk/hc/en-us/articles/203874121-Revit-2016-Fabrication-CADmep-Workflo...
However, if you are talking about the 1-1 swap that can be done using the MAJ file type, then you would use the OpenJob/CreateCAM commands. This is dependent on both the Revit model and Fabrication utilizing a CID driven databases for the objects though. If you want to take something built from families and bring those into Fabrication, then the first example is your best bet; as far as I am aware anyway.....
Here is an example of the MAJ ones done with hangers:
http://www.asti.com/News-Events/blogs/PostId/1664/hangers-on-a-sloped-roof
