Gst migration for two business in same pan no

An individual is having two business in same state .One is having only State vat registration and the other is a service business which have only service tax reg. Both these businesses are not related. Gst migration has done using the PID from state vat dept. However the PID from service tax dept was also the same because of the same pan no .The issue now we are facing is ,as the both businesses are not related,the the business with service tax reg is not added and service tax reg and business address is also not added. How can it be added as separate business circle or concern?