[otrs] Reg differentiating tickets

Hello List, I'm new to OTRS. This is my question: If my company say 'X' has sold two products(P1, P2) to another company say 'Y'. Now if we are giving support to them and tickets are being raised how can I differentiate that a certain ticket belongs to one product not the other. Say if a ticket has been associated with the problem of login authentication. How can I differentiate whether the ticket belongs to P1 or P2 .since both have the same customer name Y