When planning for a negotiation, one must calculate their BATNA, Reservation Price and Target Price. I am confused as to the differences between the reservation price and target price and the different methods to ensure you calculate them accurately.

For example, if Firm A can make a deal with Firm B for 440, Firm B and Firm C can make a deal for 380, Firm A & C a deal for 300 or a deal between all 3 firms for 480. How do you calculate the reservation price vs the target price for the negotiation?