The Zendesk Support Linked Ticket app enables you to create a child ticket from an existing parent ticket and link the two tickets together. This is particularly useful when you need to have two separate conversations around the same issue.
For example, a customer reaches out to you about an issue and you need to loop in a third party to resolve the issue. With the Linked Ticket app, you can create a child ticket from the ticket your customer submitted to start a conversation with the third party. This way the third party will not have access to your customer's information but both tickets are linked in the agent's view.