You can import building components as Autodesk Exchange (ADSK) files to provide design and connection data in a Revit project.
A building component ADSK file provides the following information to aid in the design process:
Opening or loading an ADSK file automatically creates a family from the category that is based on the OmniClass assignment made on export.
You can also save the ADSK file as an RFA file, which lets you create a family that can be used in multiple projects.