If you have held the stocks longer than a year, then there is no tax apart from the STT that is already deducted when you sell the shares.

If you have held the stock for less than a year, you would have to pay short term capital gains at the rate of 15% on the profit.

If you have held the stocks longer than a year, then there is no tax apart from the STT that is already deducted when you sell the shares.

If you have held the stock for less than a year, you would have to pay short term capital gains at the rate of 15% on the profit.

Edit:

If you buy different shares from the total amount or profits, it makes no difference to taxes.

If you have held the stocks longer than a year, then there is no tax apart from the STT that is already deducted when you sell the shares.

If you have held the stock for less than a year, you would have to pay short term capital gains at the rate of 20% on the profit.

If you have held the stocks longer than a year, then there is no tax apart from the STT that is already deducted when you sell the shares.

If you have held the stock for less than a year, you would have to pay short term capital gains at the rate of 15% on the profit.