Several States have initiated the facilitation for migration of existing assessees registered under the VAT Act of the respective States.
Click to view the State Circulars
It is requested in the portal to complete the enrolment during the specified dates. However, the window will be open till 31/01/2017 for those who miss the chance.
This portal has detailed FAQs and User Manual on Using the GST Common Portal.
Earlier GSTN had released FAQs on the procedure for Enrolment of the Existing Taxpayer on the GST System Portal.