If it was me, I'd cut several smaller limbs with green tips off the big branch, remove all the leaves except for the tips, put them in water to keep them fresh, get some spanghnum moss, soak it, and wring it out till barely damp, and put all the limbs (aka cuttings) into a zip lock with a dry paper towel or two, wrap in a towel, stick in a dark place, and wait 2 or 9 weeks. You will start seeing roots. I usually open the bag and put a new dry paper towel in.
Good luck!
Suzi