You should plant it normally and then prune it for how you want it to grow:
A. If you have deer pressure or want it to be a taller tree you can prune it to to a modified central leader
B. If you are trying to keep it flat and tall you can prune it to a fan
C. If you have the space to grow it wide and want to do fruit picking and pruning without a step ladder you prune it to an open center
Assuming you want option C, you can actually do a partial girdle to restrict sap flow to the upright growth and keep that around for this season since its already leafed out, and then after this growing season (when its dormant) just remove it entirely.
Although you might be okay just removing the whole upright growth right now, would just stress the tree a bit.
