Use the Design to Fabrication tool to convert a design model with Revit MEP elements to an MEP fabrication model with LOD 400 MEP fabrication parts.
You can convert selected parts or an entire duct or pipe network. The Design to Fabrication tool provides a more efficient workflow, since the fabrication model does not need to be redrawn from scratch. The result of the conversion is based on the Design Line algorithm used by the Autodesk Fabrication products, and uses the same content available in the Autodesk Fabrication products.
Video: Converting an MEP Design Model to a Fabrication Model in Revit
Sometimes you may need to create an association between a Revit family part and an Autodesk Fabrication part. For more information on how to do this, see Mapping Revit MEP Families to MEP Fabrication Parts.
Fabrication panel
(Design to Fabrication).

Check Systems panel
(Show Disconnects) and select one or more of the following: