They will bud (oppositely - look closely and you'll see a line of bumps from whence it will bud) just about anywhere between the tips of the branches and the root collar. They can often be air layered by simply wrapping a stem with moist sphagnum or paper towel even (just keep it damp - no tourniquet/girdle).
Thanks for the basic info. I'll make a decision on the roots when I repot next year. If I require a root in a specific place, ill leave some sphagnum in that spot and hope for best!
Tree fell out of pot, which broke, then was left to its own devices to grow. This year repotted and did some heavy root work and pruning. Getting a ton of backbudding.
I think this summer Ill let it grow out, but I have a new trunk line I like. Surprise chop next spring.