How to select nearest lower strike price

[satendra42sharma]

Please help me how to select nearest lower strike price than spot price.
For example Nifty 50 is trading at 19540, i want system to select 19500 strike price. If i am selecting ATM strike price it is selecting 19550. Kindly help

[Zumo]

You have to go to FX in strike.

Then select the small fx button to create a code.
Select ATM… then it will open a window choose your instrument (nifty 50) and choose -1 for 1 strike ITM call or 19500 CE as per your example.