Revit-Headache:

I've created a conceptual mass to inform a series of slab edges. The face of the mass defines the edge-of-slab condition and it works great. It's worth noting that the form curves in section, so each floor is offset from that above and below (in plan).

I now need to create several other 'faces', each of which is a logical offset from this first conceptual mass. I'd rather not create a new, slightly larger conceptual mass for each item. Instead, it would be ideal to tie these all back to the first form and set a parameter/label to OFFSET each from the initial form. Is this possible?

Specifically, I need the following.
+500mm = Face of Glazing
+650mm = Face of Fritted-Glazing
+1650mm = Face of Exterior Balconies.
Each of these Faces also curve in section, matching the offsets given above.

Is there a way to offset a conceptual mass, or at least one face of a conceptual mass? Our EOS (Slab) is the most critical dimension, which is why that particular mass was created first.

Thanks much.
JP.