When you allow another library to share content with you, they can publish to your Shared Library. With Direct Publishing enabled, another library can publish directly to the playlist you choose.
To enable Direct Publishing, click Administration in the navigation column, click Library, then select Direct Publishing.
In the Direct Publishing menu, you will be presented with Libraries You Share With and Your Playlists. You cannot set up Direct Publishing without first allowing sharing and creating a playlist. (See Enabling Sharing and Creating a Playlist.) In the example below, we're giving the iTunes library permission to publish directly to Your First Video Playlist.
Click Save to finish. The Direct Publishing window now shows that the iTunes library has Playlist Access to Your First Video Playlist.
Click the Delete button to revoke playlist access. The library itself will not be deleted.