You can use the Materials Paintbrush to quickly apply different colors or materials to ceilings.
To apply a material to a ceiling:
Display your model in 3D view and make sure the ceiling is visible in the view.
Select Edit
> Materials Paintbrush, or click the Materials Paintbrush button
on any tabbed toolbar.
In the catalog panel, select the material you want to apply. Paint colors are located in the Paint category, and Stucco and Drywall can be found in the Finishes category.
Click on the ceiling you want to apply the material to. The material is immediately applied to the underside of the ceiling. You can continue applying the material to other ceiling surfaces, or select another material in the catalog.
Right-click and select Finish.