Hi Mary and welcome to NGA!
Yes you can cut it back and root what you cut off for more plants! Without seeing your plant, I suggest you cut it back to a few inches above the soil then stick the cuttings into the dirt. Your cutting should be about 3 - 4 inches and bury half of it. If you post a picture I can be a bit more specific.
The picture shows a plant that has been cut back with new growth.