Yes, brokerage and charges are applicable for every child order.
The current freeze quantity for NIFTY is 1800, now if you want to enter a position for a quantity of 5000, enter 5000 in the quantity field and your order will be auto sliced into 3 orders.
1st order of 1800 quantity
2nd order of 1800 quantity
3rd order of 1400 quantity
Since each leg is a separate order, the brokerage is charged separately. In the above example, your order of 5000 for NIFTY, will be sliced into 3 orders, then the brokerage will be applicable for 3 executed slices individually. For example, If we divide your order into 3 slices the brokerage fees will be ₹20 X 3.
Click to know the brokerage charges.