Select the Save Playlist or Save Playlist As options from the File menu, or click the Save or Save As toolbar buttons. If you select Save As or you have not already saved the current playlist, you will be asked to select a file name and location.
When a playlist is saved, the contents of the current playlist, any playlist keys for the songs, the on-screen location of the playlist window, the customized appearance of each playlist item, and the source database are all saved.