Select the walls, apply the GDL. It inserts lightshafts + terrain adjustable to the wall for all openings.
AC26Edu-Aut-archive: it contains all the other of my wall-addon-parts too https://www.dropbox.com/s/cqs0wtd97or5de0/Archicad25%20GDLs%20f%C3%BCr%20Wandaddon%20innere%20Verrip...
others: https://bimcomponents.com/Profile/b642d3f9-594b-42a5-ad35-8c86bce5f276
