When adding a Master Plan Instance to an account (an existing account or during account creation), you can add one or more Supplemental Plans to the Master Plan Instance. A Supplemental Plan is a Plan associated with a Master Plan that can be purchased multiple times. It provides the ability to add a variety of additional services that are not offered in a Master Plan.
Clicking the Add Supplemental Plan button loads various fields related to the Supplemental Plan. Refer to the below screenshot and corresponding descriptions to complete the fields in this section.