Hi @kevin_schnippkoweit,

Sadly, I do not know exactly how @rosa.urenaJTRL3 did this on the project. But from what i can see on the slides, I would expect that this is automated 3D Block placement. The contained geometry is supported by the IFC 4.3 exporter so that would assure their workflow. This automated placing can be achieved through the use of Dynamo in Civil 3D. using the alignment, profile geometry and the cant values exact placement can be calculated. If needed, we can certainly help u look further in the right direction.