I just realized I put semicircular where as I meant quart of a circle. How could I access quarter round walls and quarter round staircase? I see that one can do half circle wall in Sweet Home 3D.
An arched wall you create by drawing a straight wall between two points, add Arc extent (lower right corner under Modify Walls, adjust positive/negative values until it fits).Curved staircases (objects with special cutouts in floors / walls) imported from other sources may need some extra work in the FurnitureLibraryEditor to work the way you want.
The link below takes you to a couple of test models that should work (I included a 90deg curved staircase with various cutouts and walls). Copy and paste the staircase into your own model and change size, textures etc.
SourceForge post, test cutouts
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