Thanks a lot for explainingI actually tried getting BizBlack as floater to DCB metal. Didn't work. Apparently they are in same level (as per HDFC's internal criteria), and BizBlack as floater could be issued to only higher level card (like Infinia).
In fact, they asked me to close DCB metal first, as they can't issue two core cards. I did so, and then got BizBlack.
Also they would likely confirm business as profession.
All said, please still do try. Your luck may vary. Let us know if you succeed. 🙂