You can insert a skylight in your roof with point-and-click simplicity. The catalog contains a long list of skylights in a variety of sizes.
To insert a skylight:
Select Insert > Roofs > Skylights, or click the Roofs button on the Building toolbar and select Skylights.
In the catalog, select the skylight you want to insert.
Position the skylight on the roof.
Click to insert the skylight.
Right-click and select Finish.