One of the many uses for the Join Geometry tool allows you to cut multiple objects with one instance.
When we add a Wall Mod to a standard wall we have created two independent elements in the model.
If we cut the standard wall with an opening, a door, window, or storefront system, then we have only cut one of the two walls.
You could edit a sketch of the elevation of the wall mod and draw in your door cut to match the standard wall elevation.
Of course, this does not link both walls to the door and if the door moves, requires a new sketch.
Use the join geometry tool to link the wall mod to the core wall and the door opening will automatically cut and update.