Hey!
There is no category as bx category . But there is bc category under which different castes fall under according to different states . So if i got it right i. E. It is bc category then it would be a tedious task to mention all the castes of all 29 states here.
You can check the list of all the states by following the official website of central government for which the link is as follows:
http://www.ncbc.nic.in/user_panel/centralliststateview.aspx