Different Deals - How to know which deal is associated with?

Different Deals - How to know which deal is associated with?

Hi Everyone,
We had this client that has 3 different deals with us. The deal under a specific product that was availed by the company is already for renewal, and an email notification is sent reminding the renewal. If the client responded, is there a way that we could see the previous deal that is linked to that renewal reminder? How would we know which one is it?