For all smallcases (created/customised included) a one time fee of ₹100+GST is applicable on the day of purchase. No charges for any other order placed in that smallcase.
Irrespective of the smallcase type, If you're investing less than ₹4,000 on the buy day, you are charged only 2.5% of the amount invested + GST (18% on fees) instead of 100+GST.
Other statutory charges such as STT, Transaction charges, Demat charges & taxes are applied as usual from your broker. Read more here
Your fees are deducted from your ledger at the end of the day. See more here