Fix the edges to the walls in the reference drawing with coincident constraints
- Activate the drawing window by using the File > Switch Between 2D and 3D function.
- Select
Zoom Extents. - Select
Constraints > 
Coincidence. - Select the edge line (A) of the ceiling.
- Select the outer surface line of the wall frame (B).
- Connect all edges to the walls in the same way. At the bay window, first connect the horizontal and vertical edges, then the angled edges.
- Quit by pressing the Esc key.
- Save the project by selecting File > Save.
