There is a (flat) tree containing surfaces A.(representing: walls)
There is a (flat) list of surfaces B (representing: openings)
I would like to be able to link the walls (list A), to the belonging internal openings (list B).
In other words, I would like to know to which wall, opening 1 is making an opening.
So maybe using a True/False pattern to select the adjacent surface?
Thank you in advance