As of version 2022.c, the Open BIM Analytical Model "template editor" allows users to specify that an external wall from the architectural model is a party wall.
By doing so, the surfaces derived from said external wall will be assigned to the boundary "party wall" when using the automatic generation process of the analytical model.
Party walls have also been added to the "Template" group of "Snap options" in order to control their visibility and the object snaps in the application’s work area.
