Welcome to NGA,
@Highflyer 
You can prune the vines, or just let them keep growing and the deer will probably prune them for you. Keep your beans harvested as they get to a nice size for eating and they should keep producing for a long time. If you want to save some of your own seeds to plant next year, leave the beans on a couple of the vines and they will eventually mature and dry out, then you can harvest the pods and shell out the dry bean seeds. Happy gardening!
