You can quickly import a single title by ID or multiple titles based on a set filters from themoviedb.
To import a single title, open "admin > titles" page, click on import button, then "Import single title by ID", enter themoviedb ID and click Import.
To import a multiple titles, open "admin > titles" page, click on import button, then "Import multiple titles", enter any restrictions you need (all are optional) and click import.
Important:
On some hosting providers progress bar might not update in realtime when importing multiple titles, however this is only a visual issue and importing itself will work properly.