Import Whole Library
Intead of importing single objects, you can import the whole content of a library as project elements; to do so: select the root element of the project tree, open its context menu and choose Import whole library.A file browser will appear to allow you to select the library file; once you have done, you’ll find a new folder inside the project tree, with the same name of the library, and the whole content of the library will be inside that folder.