In 1943, Sashadhar Mukherjee formed a partnership with Rai Bahadur Chunilal, Ashok Kumar and Gyan Mukherjee, and they started the studio Filmistan in Goregaon. The first film they planned at Filmistan was "Chal Chal Re Naujawan" with Naseem Bano and Ashok Kumar who had by then become a star. Sadat Hassan Manto, Ismat Chughtai, Pt. Pradeep and so many other intelligent, talented, and creative people were associated with Filmistan. Filmistan gave breaks and made stars out of Shammi Kapoor, Dev Anand and many more. Mukherjee made unforgettable and classic films there like "Anarkali", "Nagin", "Tumsa Nahin Dekha", "Munim ji", and "Paying Guest". He groomed Nasir Hussain as a Director.