Ocean libraries are stored in .oclib files. Some are installed with the software, in the libraries sub-folder.
All .oclib files stored in Ocean's library search paths are automatically loaded at startup. Just put a copy of new libraries in one of these folders, or add a new search path. Then restart Ocean and check if the library was properly loaded in the libraries toolbox
Library search paths are configured in the preferences.
Two libraries cannot have the same name. If so, only one will be loaded