The Command is CONVERT3DMODEL

Also Right click > CADmep > Utilities > Convert 3D Model(s)

This Command to extract any 3D solid/mesh, or collections, into a fabrication (CADmep) model. This enables it to be displayed in the Fabrication products (CADmep, ESTmep, CAMduct) and can also be used to do run time collision detection while modelling. Ability to automatically extract the connector position, type and size data is included.

Additionally Check this link for details of this operation and check whether it can help you to serve your purpose.

https://knowledge.autodesk.com/support/fabrication-products/learn-explore/caas/CloudHelp/cloudhelp/2...

Thanks

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