Windchill WRS API for Creating a new CADDocument

Question

Is there a REST API command via WRS for creating a new CAD Document in Windchill? I only found the "GET" command for this

http://##.###.#.###:##/Windchill/servlet/odata/v3/CADDocumentMgmt/CADDocuments

 and there is no "POST" command. We are using Windchill 12.0.2

We also need a way to associate the newly created CAD document to a WTPart