You can use the iOS feature to import an existing .immconfig file and customize policies.
Select Import from .immconfig file. Navigate to the folder and choose the file. The following figure shows that the New immconfig is imported and its values are populated in the respective fields.
Figure: iOS page
Make any modifications to policy, then select Download .immconfig to save your changes and download the updated file.
CAUTION:
You will lose any configuration changes if you do not select Download .immconfig before navigating away from the page.