Ground floor has moved on top of the walls

I’m phone only for a while so someone else will need to check your model.

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Keep the raw geometry (lines, arcs, faces) Untagged. Use Tags for Groups/Components.

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Thanks for taking the time to provide explanation and answer to the problem, also appreciate you posting the learning link, exactly what i need,
By having the floor on a separate group i cant make the walls a solid group, is that because the base is not joined at the base ?

Are redrawing on one edge to re establish a face ?