You can link the issue to an existing issue with the same subject. Once you’ve linked two issues, they can’t be unlinked.
Pre-requisite: Issue Matching is enabled.
To enable Issue Matching, Go to Issues panel, click on the ellipsis - and enable Issue Matching as shown.
Make sure you’ve entered a subject for the new issue.
Click the Issue Matches area. Issues with the same subject are shown. You can click on the link- View All xx matches to view all the issues in one view
To link to an issue, click the issue, then click Link.
To return to the list of matching issues, click Back.
To return to the Issues panel without linking an issue, click Close.