I modeled a varying bar using sweep bar option since the cross section vary accordingly. I can able to view in allplan UI and also able to generate reinforcement report for these varying bars. but when the 3d model is exported as IFC and imported into navis I couldn't able to view only the varying rebar set. (You can see clearly in the image)Although I can able to view in Solibri and other IFC viewer it was way to worrying cuz not appearing in Navis manage 2018/19.