in a simple way see ( image 1 ) that showing name of layer syntax that should be in your Autocad files you send it to us and sure to get your result you are looking for
Image 1 Wall Layer Syntax
The walls are the same as you usually draw, but it is preferable that they be connected as much as possible, and of course the number of layers is according to the heights if they are uniform. see Example (image2)
add to syntax high of Triangle how is long in center and also how long of wall for Triangle (image 3).
Image 3 wall floors Syntax
just add to syntax high of Arch how is long in center and also how long of wall for Arch (image 2).
Image 2 wall Arch Syntax
Image 3 wall Triangle Syntax
Curves and lines must be joint as possible
Image 2 Example of wall Layer