Getting started 19 Go now to the dwellings plan. Select the biggest room (right bottom one) and assign a Protected use by clicking the Protected button. The room color changes to green, which is the color of protected rooms, as you can see in the corresponding button. As identifier you may write something like "Bedroom". Now select the left room and assign a Habitable use. The color should change to yellow. As identifier you may write something like "Bathroom". Select both rooms and specify use unit "A", by typing A in the Use unit text box. The “A” letter appears, in brackets, next to each room identifier and the line between the rooms is now thinner, as they belong to the same use unit. Finally, select the third room and assign to it a Stairs use. Its color should change to dark gray. Name it "Stairs", or similar. The result should look like the figure below. © 2012 Sound of Numbers S.L.