You don't need to create a VPL when using Fabrication CAMduct 2016 or later. The 2016 version introduced a custom machine configuration feature which may be configured to work with any machine.

Per the What's New section of the Help System:

The following new features are specific to Fabrication CAMduct 2016
Custom (User Defined) Machine Configurations: You can create custom (user-defined) machine code (NC) for defining installed machine fabrication (motion path and cutting) behavior. See Installing a Custom NC Machine.

You will find a recorded session on this topic from Autodesk University 2015. 

As for exporting the nested shapes or sheets, why? You use Fabrication CAMduct to write NC and send to the machines.

Hope this helps.