The Wall tools help you quickly work out a wall design, by creating smart objects. Walls heal at intersections, and they can take block insertions that automatically align correctly.
The typical sequence to create a floor plan starts with a wall layout. When the walls have been drawn, insert doors, windows and/or openings. After that, you can adjust the wall layout by moving or rotating any wall. When you adjust a wall, the walls that are attached to it will adjust to it. Any inserted doors, windows, and openings also adjust.