PRO 18 Playlist Question ...

When I first got my PRO 18, I bulk downloaded a bunch of frequencies for my area onto three playlists. Now, I have better understanding and handle upon what I actually want to listen to, and want to CLEAR the existing frequencies on those 3 playlist channels, and reload the drilled down frequencies that I am interested in - in effect creating a cleaner playlist.



Question - how do you CLEAR the playlists completely so I can start all over again and download my desired frequencies onto these playlists ? Prolly simple, but I'm not getting it... thanks !