The procedure for selling dematerialized securities is very simple. You can login to your ProStocks trading account or call the ProStocks dealer and sell the securities. After you have sold the securities through your ProStocks trading account, ProStocks will debit your demat account with the number of securities sold by you through POA executed by you in favour of ProStocks and credit your ProStocks clearing account. Credit amount for sell of such securities will reflect in your trading account with ProStocks and you can request fund payout from ProStocks after receipt of payment from exchange by the ProStocks.