There are two ways of drawing out the keep clear or no blocking boxes.

Regular Rectangle Boxes

1. Draw along the central axis, along the middle of the box/rectangle.
   
   
2. Select the half width. This is drawn out from the previous central axis to the side of the box.
   
   
3. The box will be displayed to both sides of the first axis line.
   
   

Irregular Sided Boxes

1. Draw around the outside shape of the box, clockwise or anti-clockwise.
   
   
2. Continue until four corners have been selected.
   
   
3. The box will be displayed as drawn with the contents added inside.