Select Object(s). Open Library Menu. CLick on name Library ( symbol "+" appears)

Enter the object name. All selected objects will be added as a single library object.
If no object is selected, all objects will be stored in the library as a single object.
To import an object: Open Library, left-click - import object (object import command).
Right-click - Quick import (import command).
Use the central mouse button to rename the object.
Leave the name field blank and press OK to delete the object.