Enterprise Workspaces allows you to manage multiple brands, branches, and regions under one, unified Email Experiences account. With the feature, customers can dictate multiple organizations under one parent account. Each organization functions independently and has its own campaigns, signatures, and user base.
To manage the various aspects of Enterprise Workspaces, account owners are able to assign two different admin roles - Parent Admins and Organization Admins. Parent Admins have access to all underlying organizations while Organization Admins only have access to a single organization.
To assign an admin, please follow the instructions found here.