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OG subgroup roles creates group roles in parent group(s) for every child group.
Permissions on the parent group can be given to members of the subgroup(s) rather than adding each of the users to the parent group individually.
Parent group members can be given permissions to adminster child groups or to inherit their parent group permissions when acting on child groups and content.
It provides two basic functionalities per registration type (fill in forms with default values automatically and creating new accounts based on the registration data), the settings can be found at admin/structure/registration_types/manage/registration/fields.