Dynamic access feature allows you to create services and access maps automatically when user tries to access them.
To enable dynamic access,
Go to Services page.
Click on "Settings" tab.
Click on "Dynamic Access" section
Enable the status checkbox.
Select user group and policy to authorise dynamic access.
Now when users enter an IP/hostname which is not yet used in any service, a new service will be automatically created. Also, user will be automatically assigned to that service.