if you take the top 3 - 4 nodes you will have something that should root with luck and tlc, also, the plant itself will grow 2 stems from where you cut the top off. Do you know how to clone? there are several methods.
anyway, if you don't then do a search, there are many threads here on cloning and cloners (i built one for under $20.00 that works like a dream), if you can't find what you need just ask.

bozo,
peace, love, dope