Hi Barry,
It depends on what kind of bush you want to grow,a single trunk or multiple trunk.
Here's some example's.
Single trunk.Cut the central leader at the height you want to begin scaffolding.
Pinch out the growing tips of each of these primary scaffolds after 5-7 nodes.
Repeat as desired to keep balance.This one needs pruning,the larger V shaped branches
need to be reduced by a third to restore balance.
Multiple trunks.Bury deeply,same pruning as above.
Good Luck,
Paul