Need stone wall covering to extend over foundation wall

[chadbaker]

I have my pony wall with the stone on bottom and vinyl on top. However, I need the stone to extend below the finished floor and on to the exposed surface of the foundation wall as there are actually built. So, I need the stone to extend an extra 8" below the finished floor. I have been using AutoCAD for drawings and recently purchased CA to produce 3D renderings to help with sales. I have zero experience with CA and the help videos don't seem to tell me what I want to know. Any help would be greatly appreciated!