Define your Company/companies. Specify the departments of the defined companies, and assign your users to these departments.
Create projects, add the created project to a pre-defined company.
Specify the permissions of your users with the roles you create. Specify the names, colors, descriptions and permissions of the roles you created.
Enter user information, company, project, department information, and specify their authorizations. Ensure that personnel accounts which are defined based on such criteria and limitations are used.