Wall cleanups: Overriding

[Chad Smith]

Refer images.
I have wall 'A' that I want to merge into wall 'B', but when I do, the black filled wall overrides the other 2. How does one about overriding the wall cleanups. I've tried using the grips to move the walls in and out but the result is always the same.

[beegee]

Break apart wall B and the solid black wall. From the tools menu, choose Edit wall joins. Place the box over just those walls and select " do not join". Now, join wall A and wall B, then align the end of the solid black wall with the face of the joined wall AB.

[Chad Smith]

Excellent, I knew there had to be a tool for this.
BTW, thanks for all the past help too, your a wealth of info for the whole forum.