Saving Rectangular Doors and Windows from 3D Model Elements

In the 3D window, save the selected elements with the File > Libraries and Objects > Save Selection as command, and choose Window or Door.
In the Save Door (or Save Window) dialog which appears, enter a name and choose the desired folder location for the new opening:
Note: You must reserve the BIM Server Library folder before saving to it
Click Save.
The Change Object’s Basic Settings dialog box appears. Here, you can define the new library part’s default Surfaces, Fills and Pens. Even after placing the library part, you can further fine-tune these attributes in Object Settings.
Click OK.