There are two levels of users with permissions for adding and editing Applications: users with the Create Applications permission and Global Administrators.
Create Applications Permission
Users with the Create Applications permission (granted at the global level at Administration > Security > Global Permissions) can create Applications by clicking the "+" in the top menu.
Users with the Create Applications permission can edit an individual Application definition from the Application-level Portfolio Settings > Edit Definition interface.
In addition to the access granted to users with the Create Applications permission, Global Administrators have access to the overall Portfolio and Application administration interface at Administration > Configuration > Portfolios. From this page, they can create and edit Applications.
Global Administrators also have access to the Projects Management page at Administration > Projects > Management. Changing the selection mechanism on this page to “Portfolios” or “Applications” lets you manage the Portfolios or Applications of your SonarQube instance. The dropdown menu to the right of each item lets you edit permissions, apply Permission Templates, or restore access to a Portfolio or Application.
Once your Application exists, you can populate it with manually-selected projects. By default, the configuration interface shows the list of projects currently selected for the application. To add additional projects, choose the "Unselected" or "All" filter.
Creating Application Branches
Once your Application is populated with projects, you can create application branches by choosing branches from the Application's component projects. This option is available in the Application's Application Settings > Edit Definition interface, or from the global administration interface.
By default, Applications are queued to be recalculated after each analysis of an included project. For each relevant Application, a “Background Task” is created, and you can follow the progress on each in the Administration > Projects > Background Tasks by looking at the logs available for each item.