If the BIMx is published as Hypermodel, and has some section sheets included, a section can be used to move the vertical cutplane.
However, if it is published as a model, without any included layouts, there is no way to generate a vertical cutplane. All the other BIM viewers have this option, and most of them define the vertical cutplane by clicking on an existing vertical face.
Some also have an option to generate an angled cutplane, or a cutbox, that can show the model outside, or inside, the box.
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