In SU, make a scene (View menu > animation > add scene) with your plan view without the section cut and another one for the elevation view with the section cut.
Now in LO, in the tray > SU model > View tab, somewhere at the top right you can change which scene to display. You cannot access section planes and cuts from LO so all has to be set up in SU.
When we get to the end of this, I may chop this topic into two and move this second part into the LayOut forum.