I have lost bits of my walls

Somehow I have lost the tops of these walls, and the whole face of a wall there behind the stairs (see items with red arrows and red oval.) When I try to draw basic rectangles (endpoint to endpoint) to remake these portions and then erase dividing lines to join them, It puts a whole big solid white “ceiling” on this whole level. HALLLLLPPPP. Please and thank you. And…I tried grouping, but it gave me hell when pushing through windows. So I ungrouped a lot. I don’t really use tags. Is there a solution without having to go back and group and tag? Because that seems to mess me up anyway.

Basics of SketchUp at Campus - learn.sketchup.com, learn about groups, components, tags.

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