Anchor the Door/Window reveal to either the Wall face or the Wall core (the closest core skin, if there are several core skins). This is relevant if you are using a composite Wall.
You may wish to anchor openings to the Wall core if
•you later make changes in the Wall’s composite structure (e.g. thicker insulation). The reveal depth will automatically adjust to maintain the window’s distance relative to the Wall’s core skin.
•you place openings into several similar composite Walls (that only differ in the finishes, e.g. a brick finish and a plastered wall). The openings will be aligned; you don’t have to adjust Reveal depths in order to keep them aligned.