Government has said a new window for registration for Goods and Services Tax for excise, service tax and VAT payers will reopen on June 25th.  Talking to media, Revenue Secretary Hasmukh Adhia said traders and businessmen can enroll themselves on GSTN website. Two rounds of registration have already taken place.  80 percent of the 80 lakh assesses have already migrated to GST network. GST is all set to roll out from the 1st of July.