KARACHI, Jan 13: The Central Board of Revenue has agreed to open an additional window of Collectorate of Sales Tax in the KCCI premises. It will work for three days, from 13 to 15 of every month from 9.30am to 5pm (Friday 9am to 12.30pm). The directorate will also depute sales tax officials for initially collection of summary statement from the registered persons, on their sales and purchases. — APP