Article break wall tool and color on a single wall

[Monique]

Hi, I need help
I applied the break wall tool to cut the wall; I get into the wall but the only way I can cut the wall it is not in the corner but about 1 feet away; I went in the plan defaults and dissabled snap to grid, without any success, also I got a hard time to have a nice taupe color and grant beige from B Moore...
Thanks in advance