If you are a Full Administrator you can create Groups and assign them to Group Managers.
First, log into your MackinVIA Administrator account (https://www.mackinvia.com/Admin) with your Mackin.com email address and password.
Choose Classroom > Groups (make sure you select the correct VIA if there is more than one account).
Click the Create New Group button on the Groups screen.
Then select the desired individual in the Manager dropdown. (By contrast, when creating a Group, Group Managers can assign it to themselves or to All Group Managers but not to other individuals.)