Section cut of landscape, dashed line cut?

What is the proper way of making a section cut that shows the existing level, to be imported as a view port to Layout? Making two section cuts in opposite directions seems to do the trick. Are there other more simple way to do it?

Further, in Layout, I would like to use a dashed line to mark the existing level. Can the style of the section cut be changed from a solid line to dashed line in SU?

Matt Donley show you à trick


Thanks for linking the trick, the trick by Matt Donley shows how to hide everything on the other side of the section. However, my question is that is there a way to apply a dashed line property to the section cut line? Styles allows one to change the color and the thickness of it but, but not the type of line?