On the new Upstox app, from the ‘Account’ section switch to ‘Upstox for investors’ mode if you’re on Upstox Pro mode
Step 1: Switch to ‘Stocks’ from the navigation bar.
Step 2: Scroll down to ‘Orders’ in your ‘Portfolio’.
Step 3: Look for your Limit order and click on it.
Step 4: Click on ‘Modify’.
Step 5: Modify the Amount/Quantity.
Step 6: Confirm the order and that’s it.
Note:
1. You cannot modify the validity of the order
2. You cannot change the order type from Limit to Market/SIP