Click Media Library, and then find the item you want to play.
Right-click the item, and then click Play In Playlist.
All the items in the same category as the item you clicked are listed in the NowPlaying category in MediaLibrary. The Player plays the item that you clicked and then plays any additional items after it.
Note
You can save items in any category as a playlist by right-clicking the category, and then clicking Save as New Playlist.