22 will solve your problems perfectly for this situation.
But in the mean time I would create separate complex profiles for the cavity wall and the concrete footing (foundation wall).
That way you can have a foundation wall with a vertical stretch for the brick step down, and a horizontal stretch for the brick ledge width if you want.
That means only those portions stretch as you change the wall height and thickness.
Otherwise you need many complex profiles for the various sizes required.
Make sure the foundation wall includes an empty cavity fill to cut the insulation in the cavity wall.
Then have a complex profile for the cavity wall.
So long as the building material strengths for the fills in the foundation complex profile and the floor slab are stronger than those used in the cavity wall, the concrete wall should cut away the lower portion of the wall framework.
If you want to include the bottom stud for the framing then I would include that in the foundation wall profile (again stronger building material than the cavity wall fills).
Otherwise you will need to create many cavity wall complex profiles for all the various step down heights.
Barry.
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