No, I think that their pricing is quite definitive on this one.
Intraday, if you buy 200 shares of Unionbank @Rs. 97, and sell it at 97.5, it will be charged as per their brokerage calculator, whether it is executed in one part or many, whether using bracket order or cover order or MIS. The total turnover will be Rs. 38900/-
https://fyers.in/brokerage-calculator/
The issue will not arise if you trade 2000 shares, because the brokerage is still less than Rs. 40. But there may be an issue if you were to trade 20000 shares. In that case, I guess the buy orders all have one order number, so the buy side will be charged Rs. 20, but I think it will be different for the sell side - there 0.01% or max Rs. 20 will apply.
Right ?