Planning your security configuration begins by answering the following questions:
What are the departments you want to create?
What are the admin groups you want to create to administrate those departments?
Which admin groups will administrate which departments?
Which administrative users will belong to each admin group?
Answering these questions will help you determine the number of admin classes and user classes you will need to create.
Recommendation
Unless you have business reasons for not doing so, Kaseya recommends the following:
A department should be created for each customer organization. You may need to create more than one department for larger organizations.
Service providers should be defined as administrative users. Administratrive users manage the permissions of department users and typically administrate multiple departments.