TradeStation  Help
        
        Canceling an Order in TradeManager
        You can quickly cancel an individual order, all open orders, or all orders for a specific symbol from the TradeManager window.
        
            
  Activate the TradeManager window and select the Orders, Average Price or Staged Orders tab.
        
            - Right-click the desired order to cancel.
- Cancel this order for [symbol] - Cancels a single order.
 - Cancel all orders for [symbol] - Cancels all orders.
 - Cancel all open orders - Cancels all open orders.