Rasagar/Library/PackageCache/com.unity.probuilder/Documentation~/Face_Duplicate.md

Duplicate Faces

The Duplicate Faces action copies each selected face and either creates a new Mesh or leaves it in the same GameObject as a sub-Mesh, depending on the default options.

Tip: You can also launch this action from the ProBuilder menu (Tools > ProBuilder > Geometry > Duplicate Faces).

Duplicate Options

By default, when you duplicate a face, ProBuilder copies it into a new GameObject. However, you can choose the Submesh option from the Duplicate To drop-down menu to save it as a sub-Mesh in the same GameObject.