GST Migration starts From 16-December-2016 for Haryana State, Once Dealer will log in on Haryana Commercial Tax Department Portal i.e. https://haryanatax.gov.in/HEX/appmanager/HexPortal/HaryanaExcise and enter user id and password of the client using his Login Id (VAT TIN) and credentials.
It will show pop-up window which will show details of GSTN Provisional Id and Temporary password on screen to enroll on GSTN Portal.