ZBrushCentral

Apply transparency to only part of a subtool?

I sculpted a wine bottle encased in a loose macrame weave as a single subtool. In my BPR single pass render, I want the woven material to appear 100% opaque and the glass bottle to be semi-transparent. I know that you can paint multiple materials onto one subtool.

-Is there a way to assign different levels of translucency to a single subtool?
-Or do I need to divide it into two subtools?
-Is there a material that is designed to use multiple transparency levels?

Thanks