Registration of gst

If they are in different states, separate registration is must.

4 divisions you mean 4 different verticals  only the entitty code will change you can add 35 such verticals so the entity code changes for all 4 divisions in same state 

if with in the state then registration is not mandatory for each division??

then how billing would be done

so i dont need to take differenrt registration??

ok understood if you have only one TIN and 4 divisions only one registration is reqyired but under Business you mention all 4 divisions 

All 4 Divisions can have separate bill book...i heard of centralised biling...