The section planes can be manipulated with the sectioning gizmos, available from the Sectioning Tools tab 
Transform panel. You can also manipulate the section box numerically. Section planes can be moved and rotated but cannot be scaled.
By default, when a section plane is made current, the move gizmo is used, unless you have already selected the rotate gizmo before activating the section plane. All gizmos share the same location/rotation. This means that moving one gizmo affects the position of others.
You can only manipulate one plane at a time (the current plane), but it is possible to link section planes together to form slices.