Hey,
This is an interesting question… I don’t believe there are nodes for doing it and it seems to require a bit of setup…
From this post’s link it seems that you can’t just create walls, and you cannot even add layers to walls… So all you can do is start with a template which contains a number of walls with different wall layer quantities…
Then you can maybe start to duplicate, rename and edit the properties of those pre made walls?
Good luck 
Mark