On most modern trading platforms, converting a position directly from a delivery-based CNC (Cash and Carry) order to an intraday MIS (Margin Intraday Square-off) order after execution is restricted or unsupported, because CNC is designed explicitly for long-term delivery holding. If you wish to trade intraday, you must select the intraday product code prior to placing the order. Attempting to modify settled delivery positions into intraday margin trades usually requires squaring off the existing holding and entering a fresh intraday trade.