diff --git a/ibkr/client.py b/ibkr/client.py
index c2f07d7..45a8034 100644
--- a/ibkr/client.py
+++ b/ibkr/client.py
@@ -1,7 +1,7 @@
 import pandas as pd
 
 from datetime import datetime
-from ib_insync import ComboLeg, Contract, IB, Index, Option, Order
+from ib_insync import ComboLeg, Contract, IB, Index, Option, Order, Trade
 from ib_insync.util import isNan
 from typing import Callable, List
 
@@ -9,6 +9,7 @@ from .currency import USD
 from .exchange import SMART
 from .market_data_type import LIVE
 from .option_leg import OptionLeg
+from .order_action import BUY, SELL
 
 class Client:
 
@@ -77,7 +78,7 @@ class Client:
         self.ib.qualifyContracts(option_contract)
         return option_contract
     
-    def submit_combo_option_order(self, legs: List[OptionLeg], quantity: int) -> None:
+    def submit_combo_option_order(self, legs: List[OptionLeg], quantity: int) -> Trade:
         combo_legs = []
         for leg in legs:
             option_contract = self.get_option_contract(leg)
@@ -96,9 +97,18 @@ class Client:
         combo_contract.comboLegs = combo_legs
 
         combo_order = Order()
-        combo_order.action = 'BUY' # TODO: Document the logic behind this.
+        combo_order.action = BUY # TODO: Document the logic behind this.
         combo_order.orderType = 'MKT' # TODO: Limit order support.
         combo_order.totalQuantity = quantity
         combo_order.transmit = True
 
-        self.ib.placeOrder(combo_contract, combo_order)
\ No newline at end of file
+        return self.ib.placeOrder(combo_contract, combo_order)
+    
+    def submit_stop_loss_order(self, trade: Trade, stop_loss_price):
+        stop_loss_order = Order()
+        stop_loss_order.action = SELL if trade.order.action == BUY else BUY
+        stop_loss_order.orderType = 'STP'
+        stop_loss_order.auxPrice = stop_loss_price
+        stop_loss_order.totalQuantity = trade.order.totalQuantity
+        stop_loss_order.transmit = True
+        return self.ib.placeOrder(trade.contract, stop_loss_order)
\ No newline at end of file