Every "storey" inside ARCHICAD becomes an IfcBuildingStorey. I don't think you can avoid this in the IFC Manager as that mapping is not user editable in ARCHICAD.
Levels in Revit have a "buildingstorey" property which you can toggle as Revit users use much more levels than just the building storeys.
--- stefan boeykens --- bim-expert-architect-engineer-musician ---
Archicad27/Revit2023/Rhino8/Unity/Solibri/Zoom
MBP2023:14"M2MAX/Sonoma+Win11
Archicad-user since 1998
my Archicad Book