a peach tree
I purchased a peach tree that is about 8' tall. I would like to create scaffolding shape with three or four limbs starting at about three feet but the base of the tree is about 2" diameter and where I want to cut the trunk off the diameter is 1 1/2" in diameter. I will be cutting the top 5' of the tree off won't that kill the tree?
This kind of pruning will want to be done when the tree is a little younger. That is a lot of tree to be cutting off at one time. I would have to suggest cutting much less than that off, then tying the larger growth down until it retains that shape.
This article can help: https://www.gardeningknowhow.com/ornamental/trees/tgen/living-tree-sculpture.htm