Virtual internal walls

 
A virtual internal wall is the internal wall between 2 zones which exists purely to sub - divide the spaces and has no corresponding wall in the actual building (i.e has zero area). To set an internal wall as a virtual, select the internal wall and set the “Virtual internal wall” property to “Yes”.
 
Once set the color of the wall in the drawing palette and in the navigation tree becomes yellow to easily identify the Virtual internal walls.