Yes . You can . However you can sell delivery only once shares are available in your Demat Account with ProStocks . Demat Account opening is Free . Trading and Demat Account is life time AMC free , as such you do not have any cost for opening new account. You can transfer only those shares from your ICICI Bank Demat account to your ProStocks Demat Account just before you want to sell . whenever you buy , You have an option to take payout directly in your ICICI Demat Account .