vaulted ceiling

delete the parts don't needed.

2. Use 'Draw Arc' to draw a arch shape, then delete the two sides at the corner.

4. Use 'Extrude' to give the remained shape a thickness, then you get a curved ceiling.

3. Use ' Offset' to draw a smaller arch size, use 'Spline' to connect these two arch shapes at the bottom. Then delete the parts don't needed.

Hello, 1. You may go to ' Interior Modeling 2.0'，use 'Rectangle' to draw a surface on a wall.