So long as your wall is displayed as "Projected" or "Projected with Overhead" and the footing part is below the Floor Plan Cut Plane, then you can set the 'Uncut' line type of the wall to a dashed line.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10