EVERYTHING ABOUT PNL

$ Within the "do the job situation" you liquidate the portfolio at $t_1$ realising its PnL (allow me to simplify the notation a tad)$begingroup$ I estimate day by day pnl on the CDS position using the distribute alter instances the CS01. Nonetheless I want to estimate the PnL for an extended trade which includes long gone from the 5Y CDS into a 4Y