When sketching rebar in place or for a family, you can use the following graphical controls to modify the rebar hook orientation and location. See Sketching Planar Rebar and Rebar Shape Family Editing Tools.
Moving tie and stirrup hooks
Toggle the SPACEBAR to move the hooks of ties and stirrups.
Toggling hook orientation
A toggle hook orientation control is available at each end of the rebar. You access these controls through sketch mode.
Swapping hooks
Notice the hook orientation controls.
Rebar Hooks Swap Sides