For instance, it is possible to create and configure a role for Sales, a role for Finance, a role for Warehouse and another role for Procurement.
Those roles will have to be configured to allow access to either sales, finance, warehouse or procurement windows, processes and forms. To learn more about how to get that working visit Role.
Whenever, there is a new member in the organization a new user could be created and assigned to any of the existing roles instead of creating and configuring new users permissions every time.
There can be a user having a given role set up as "Role Administrator", that user will be able to add new users to that role.