Posted: 14/02/2015 at 21:28
Hi nellie, you really need to wait until late April or May before taking cuttings. You need the fresh new shoots as rosemary probably won't root from old wood. There are details of how to do it in the 'How to' section:
The old bush may or may not survive being transplanted into a pot (I wouldn't give it much chance to be honest), so I would wait until you have rooted a few cuttings before risking it.