Prcedure of centralized registration

Just go to aces.gov.in. register and fill the ST1 and attach the documents as necessary as per the checklist for centralized registration.

https://www.servicetaxdelhi.gov.in/WriteReadData/07st2012.PDF

its the link where you will get the information.

Advantage is you have to file only one ST3 for the company. If u dnt take centralized registration then u have to get multiple registration for branches and then file the returns