The method to model and quantify concrete walls should follow the same guidelines chosen for "Concrete Columns, Beams, and Slabs".
Quantification Rule: The quantification unit for concrete walls must be the net volume of the wall, referring to the volume excluding all openings and voids.
If there are any additional criteria regarding the openings (e.g., deducting only openings larger than a specific area), they must be described explicitly in the Bill of Quantities (BoQ).