If you are using the Fyers Desktop app, there is a basket order facility in there ( CTRL + b) where you can place the 2 legs of the straddle strategy from the same window.
But, if you are using the web or the mobile app, you will have to place the 2 leg orders manually one after the other,
You can calculate the straddle margins from here:
https://fyers.in/margin-calculator/span-calculator/208
To activate your margin benefit facility for hedged position orders, the instructions here:
