Automatic Linework plan view

Hi,

I have a question if it’s possible when a wall is standing on top of a floor as shown in the detail! Comb25032018042445 you can automatically make all the interior Lines of that inner wall in a plan view dashed?

We do it now with the LW tool but it would save a lot of time and mistakes. So dynamo would recognize if the wall is on top of a floor.

I already saw it in an other topic but that was for alle the walls

Thanks a lot

So it looks like this: