Service tax/excise reg no

Hi, If any business man get registered their self in State of Delhi and after some period he again registered his business unit in another state let say in UP , My query in regards to Service tax or Excise ,,, What would be the registration number generated by the department. As we know registration number are PAN+ST/ED+001 At the time of first registration its already allotted so what would be at the time of second unit registration. further , whether we really need to get registered for second unit in another state or not???? we can not work with the same registration code. " for your assistance first registration was single premises based"