Assigning Custom PSets to ifcBuildingElementParts

[PeterPetersen]

I would like to assign PSets to individual layers of composites (e.g. to a layer in a slab consisting of concrete, insulation, screed and flooring). These elements are already being exported to IFC Schema as IfcBuildingElementParts. Archicad also allows to assign own properties to materials (see image attached - D4D pset). 

Is there a way to connect these material properties to a PSet in IfcBuildingElementPart? 

This would enable transfer of data for all components of a composite element - which opens lots of possibilities for creating semantically rich IFCs for coordination and life-cycle assessments.