Wall piers are typically assigned in the model to the wall over height of floor (as in Figure d below).
Often, it is more appropriate to assign the pier to the height of wall adjacent to opening (Figure a or c), resulting in better calculations of shear/moments from the area object directly above/below the opening.
Unlike wall pier elements, a single wall spandrel element can include area
objects from two adjacent story levels. For Spandrel labeling you can follow the following figure