A skylight can be created by selecting Build> Roof> Skylight and drawing a rectangular polyline within a single roof plane. This single operation places a flat panel skylight into a roof hole, produces a hole in the flat ceiling platform below, and automatically generates the skylight shaft between these two holes.
Select the skylight and click the Open Object 
edit button to open the Roof Hole/Skylight Specification dialog. See "Roof Hole/Skylight Specification Dialog".
The polyline that defines the shape of the skylight can be moved and reshaped like a standard polyline, but it must remain contained by one roof plane. If you clear the Skylight check box in the Roof Hole/Skylight Specification dialog, the curb and glass for the skylight is removed but the opening remains.
By default, the flat ceiling hole does not display separately, but it can be edited separately, and even deleted from the roof plane entirely. See "Roof Hole/Skylight Specification Dialog". If the roof plane is deleted, any holes it contains are also deleted.
The system maintains the opening as a closed polyline. The Break Line 
edit button forms a joint in an edge of the roof opening just as it would in a roof plane edge, but does not sever the edges at the joint.
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