Can you post a picture of it ?

For propagation, your two options are grow from spore, or root division. I regularly do root division on various ferns (but not tree ferns) and never lost one yet. However please take advice from someone who grows this species before taking the knife to your precious fern !

Growing from spore can take a long time, but is very rewarding if you have the patience for it. Most types of fern like moisture, so if you have a propagator then that helps, but you could also use a plastic box with a transparent lid.