Adding additional place of buSiness

WE HAVE MIGRATED TO GST WITHOUT ADDING ADDITIONAL PLACE OF BUSINESS WE HAVE NOW STARTED NEW PLACE OF BUSINESS IN SAME STATE NOW WE WANT TO ADD THIS BRANCH AS ADDITIONAL PLACE OF BUSINESS HOW WE ADD THIS ADDITIONAL PLACE OF BUSINESS UNDER GST REGISTERATION AFTER MIGRATING WITH GST PLEASE GUIDE US AS SOON AS POSSIBLE