Are you trying to propagate it? That's what it sounds like. If so, you need to cut a piece of the rhizome (the bottom bit that the leaves and roots grow off) off with leaves and roots.
Use a sharp, CLEAN blade to cut it and you should be right.
When I cut mine I try to cut 2cm or more of the rhizome off, and make sure the piece I'm cutting off has at least 3-4 healthy leaves (more is better) and a healthy chunk of roots on it and I've always had success getting it to grow.
Hope this helps. Good luck