Transform

You can move, rotate, and scale a section box like any other object in Blender.

Plane Transform

You can move individual planes of the box by clicking and dragging the black handles located in the center of each one. Or transform them by a specified amount with the Plane Transform setting.

Commit

Commit the changes with LEFT CLICK.

Cancel

Press RIGHT CLICK or ESC while moving, to reset the plane to its last location.

Edge Transform

You can move the edges of each plane additionally to create a huge variety of shapes. Or transform them by a specified amount with the Edge Transform setting.

Therefor click the plane which edges you want to move once, then hold E to enable handles located on each edge. You can change this hotkey in the Preferences

These handles behave just like when transforming a plane, but shifting only the edge.