How to define USERDEFINED types in RelatedIfcEntityNamesList

[araccaine]

As I understand the documentation, the field RelatedIfcEntityNamesList can have multiple related IFC entitites.

• Without any type would be e.g. "RelatedIfcEntityNamesList": [ "IfcBeam" ]
• A IfcBeam with predefined type LINTEL would be e.g. "RelatedIfcEntityNamesList": [ "IfcBeamLINTEL" ]

But how do we define a IfcBeam with the USERDEFINED type MyBeam? Do we need to define a new relation with IsChildOf or something like that?