For example, you bought 100 Reliance at Rs 500 five years back, which has been lying in my demat account. Today you do an intraday trading of selling and buying.
If Reliance is trading at ₹450(at loss for you), can u sell the same 500 share from your holding and buy it again the same day at lower price without affecting your P&L.
Intraday trades do not have any effect on the Average price and P&L of your holdings. You can learn more here,