To create a room on the current drawing, go to
Ribbon: DM Electrical->Buildings and Rooms-> 
Create Room
Pulldown Menu: DM Electrical->Building Definition->Create Room
Create New Room Dialog Box
Room Number: The name of the room.
Room Type: The room type taken from the room project schedule. Determines the default settings for the room. See the Room Project Schedule section for more information.
Floor: The floor with which the room is associated. See the Floor List section for more information.
Create Room: Press this button to create the room on the drawing.
You will be prompted to specify the point at which you will begin drawing the room.
Specify first room point:
You will then be prompted to specify additional room points.
Specify next room point / <Finish>:
Press ENTER to complete the room outline.
The room will be displayed on the drawing. You will be prompted to select the location for the room label.
Specify room info location:
The room label will be inserted on the drawing with a leader pointing to the room.