We can assign different surface and displacement to different faces.

 

Setting Up Group

To add a selection of faces to a group:

Assigning Material To Groups

Add a Material.

 

If you want to assign both Bxdf and displacement shader, you will need to connect to the collect_output both the surface and displacement shaders inside a PxrMaterialBuilder node. 

Assign your group to the material by setting the Material to either a collect vop (see above) or a Bxdf.