HELPING THE OTHERS REALIZE THE ADVANTAGES OF PNL

$ While in the "function circumstance" you liquidate the portfolio at $t_1$ realising its PnL (allow me to simplify the notation a tad)The portfolio of bonds may have a selected DV01, that can be utilized to compute the PnL. Can another person tell me if this is right or is there a thing far more? For equities it should be just an easy sum of stock