In LBS (LEAP Bridge Steel), it appears that cross frames (CF) and stiffeners are not exported to the DGN file. The screenshot below is from LBS Tutorial 2, which highlights this limitation.

The goal is to streamline CAD detailing by having LBS generate steel details—such as stiffeners, diaphragms, and cross frames—directly in the DGN file. This would allow CAD technicians to simply review and adjust the elements as needed, rather than modeling them from scratch.