I have never tried with a branch that large. I would make that into a few cuttings each no larger around than a pencil and about 8 inches in length. When I make woody stem cuttings I gently scrape away the outer bark on the lower 1 inch or so, coat the area with Rootone rooting hormone and make a hole with my finger in the soil in a container. Slip the cutting into the hole, gently push the soil into place and do the same with the rest of your cuttings. When I do my cuttings, I remove about 1/2 of the leaves on each cutting. If the remaining leaves are big, I usually cut them in half to help reduce the stress and strain on the cutting. Carefully water the soil so as to not disturb the cutting/Rootone and keep the soil moist.
I use a water soluble root starter at 1/4 strength to water the cuttings and make sure the containers are well drained. In order to help keep the cuttings from drying out I group the containers together in a bright, warm place out of direct sun and place a "tent" of clear plastic over but not touching the cuttings to form a small greenhouse of sorts. It takes about 6 weeks for new roots to form, but they are very fragile so handle the new plants carefully.
