With Brokerage other than Standard Brokerage (flexible) & Minimum Brokerage:
If you have opted for any other brokerage rate than standard then you can feed your brokerage rate in flexible brokerage tab.
Minimum brokerage tab is also provided to input minimum brokerage if any. It helps you give more accurate brokerage calculation.
Example: Imagine broker XYZ has a standard plan for Equity Intraday @ .05%, but if you have opted a different plan where you can trade in Equity Intraday @ .02%, then you can use flexible brokerage field.
Suppose if broker XYZ also charges minimum brokerage of Rs 25 or .01% whichever is higher. In such a case you can put your minimum brokerage. This is an optional field.
By using flexible brokerage and/or min brokerage field, you actually overwrite standard brokerage plan.