Project links allow you to associate a particular Confluence space with a particular JIRA project, or a particular Crucible project with a JIRA project, etc.
If you have more than one instance of the same application (for example, you may have two Confluence sites), you can link a project to the primary application instance or any other instance. (If you are not sure what a primary instance is, please refer to Specifying a Primary Application Instance.)
Refer to the Application Links Administration Guide for instructions on configuring your application link, before you attempt to create a project link.
-- Default Instance --'.
You can add a project link to your Application Links suite via the JIRA or the Confluence administration screens. The project link will then appear in the list on the administration screen where you added it.
Now you need to synchronise with the other applications in the Application Links suite. This will let the other applications know that the project link has been added. Now you need to synchronise with the other applications in the Application Links suite. This will let the other applications know that the project link has been added. For example, if you added a project link from a Confluence space to a JIRA project via the Confluence administration screens, you should synchronise so that the JIRA project knows it is linked to the Confluence space.
Due to a current limitation, the instance that you are synchronising from must be called 'jira' if you are synchronising from JIRA, or 'confluence' if you are synchronising from confluence. See APL-2.
Application Links Administration Guide