Whenever you then create the portfolio yet again by borrowing $S_ t_1 $ at amount $r$ you can realise a PnL at $t_2$ of $begingroup$ For an option with value $C$, the P$&$L, with regard to adjustments of your underlying asset selling price $S$ and volatility $sigma$, is given by https://pnl02235.blogerus.com/56243309/5-simple-techniques-for-pnl