You can draw separate walls, stacked on top of each other.
Or draw the most typical wall from floor to roof,
then apply either 3D polygons, extrudes, or walls on the face of that wall
with the texture of that part of the wall.
I tend to use extrudes. Set to a front or side view, draw a polygon
over the wall area that I want to cover in a different material,
then extrude how ever much you want. Then go to a top/plan
view and move the extrude to position it where you want it in front
of the wall.
I only get into this later on in the design since changes to the wall layouts also requires fiddling with these other parts, slowing down the work.
I am interested to hear how others tend to deal with this issue.