Do you use root cubes (root riot, rapid rooter ect..)?
Air layering is a method of creating a small rootball on a branch, without cutting the branch off until it has taken root.
Slice halfway through a wet cube, slightly scrape a section of branch, add root hormones if desired, place the cube around the branch, and wrap the cube with clear plastic of any sort, secure the ends of the plastic to keep the cube from drying out.
Within two weeks, roots should be visible through the plastic, then cut off the branch below the new root system, and WhAlaaa!!!
New plant.
Google it.
Best. Cloning. Method. Ever.
Works on even the hugest branches.