You can set them up but you aren't scored for it and it's very tedious so best practice says not to do it. Rarejem: you shouldn't be offering substitutions across departments though.
Not sure what you're talking about. I don't think that I said that. Substitutions have to be made from the same department.
You can VIBE them with an appropriate substitution. (another shirt, bra, etc. at the same discount - will have to be done at the register.)
.. sounded like you were saying if you're out of stock on a shirt you could sub a bra. misunderstood i suppose.