Does anyone know if there is a way to display the portion of the foundation walls under the grade line in an elevation view as dashed or halftone even? I need to be able to handle a standard elevation but then if a 3 car garage is added I should just be able to refresh the elevation and have it still work.

Selecting the checkbox in the material for displaying hidden edges doesn't really work for this as it shows the whole foundation dashed and dashed openings on the rear of the house and other stuff that shouldn't be shown on a front elevation.