Connect the iPhone to a PC or Mac via USB cable and open the iTunes application.
Note: iTunes may open automatically once the iPhone is connected.
Click File and New, and then tap Playlist.
Note: In addition to standard playlists, iTunes also supports Smart Playlists that allow the user to create a custom playlist based on a variety of search criteria including artist, genre, album, etc.
If the Menu Bar is not visible, click the Options icon and click Show Menu Bar.
Click and drag the tracks to the playlist.
To rename the playlist, double click the playlist name.
Enter a new name for the playlist and press the Enter key on the keyboard.
The playlist is created.