Hi @Happy_Life Dhan offers Forever Order that you can place, which is similar to an GTT order.
Additionally, if you do require Trailing Stop-Loss, you can enable the same as below - Introducing Trader’s Best Friend: Trailing Stop Loss on Dhan
In addition to this, Dhan also provides Cover and Bracket orders for your intraday trades. These are exchange specified orders that also provide you time-priority for execution compared to Trigger based orders like GTT or Forever.