How to link ifccostitem to an archicad object

[Roger C]

The IFC Schema has a class named ifccostitem. You can assign a building cost to an ifc construction object like an ifcwall, ifcslab or even an ifcbuilding. I'd like to know if it's possible to create a property to assign a cost to an object and link it to this ifc class. I've been digging into the ifc project manager, but I can't find any ifccostitem class.

Is it possible and how to do it?