Are you looking to create a Matrix for traceability of issues?
It depends on the complexity of your Matrix - something simple such as tracking which Stories belong to Epics which correspond to a Project could be achieve using the Issue Search at a basic level.
If you need something more official - you could try an App such as TraceabilityX for Jira
Another option is to build a Traceability Matrix using Confluence - I found an answer on another question sums this up really well - see here
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events