The 'Save Selection As Library Part' is just a menu (folder) that you can create yourself if it is not already in the existing menus.
In that menu you then add the commands for save as object, door, window, etc.
There is also a command for other special component subtypes - No CC Subtypes.
These subtypes are GDL objects (macros) that are part of the loaded library.
For things like door leaf, handle, curtain wall frame, etc.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11