Hi @ameenalit,
Good to see you back on community after a while and not sure how we missed this! If you already have an open position in, you won’t be able to place TP/SL using Super Order, as Super Order requires an entry order (main leg) along with TP/SL.
However, as an alternative, you can still set target and stop-loss orders for your open position in normal/delivery using the " Forever OCO" option. We have explained more here - Introducing Forever Orders (with OCO) on Sell Side