Don't know if it can be done.

So I download the eposiodes at home so I can listen in the car. However I want to clear some space so I want to get rid of the download. I do not want to remove it from my library. I listen to the non downloaded episodes at home so I may want to re listen to it I just dont want it downloaded. So the swipe and delete method wont work becuae it removes the epiusode completly.