@Choirboy Nice to see you around the Community. 👋🏽
There isn't currently a feature that allows you to manually create a playlist based off of your collected radio stations.
If you'd like to see something like that added to the service, I recommend creating a feature request for your suggestion here.
This being said, Pandora does automatically generate these type of playlists for you.
After you have thumbed up enough songs on any given station you've created, we'll automatically generate a "Thumbs Up" playlist for that station. In other words, we'll collect your thumbs up from that station into a unique playlist, so you can access all of your favorite tracks whenever you want.
Hope this helps!