A "Company" org-unit represent a legal entity such as the company itself, one of its subsidiaries, another partner company, etc.

A "Institute" org-unit represents a permanent organizational body created for a usually non-profitable purpose such as education, art, or science.

A "Structure" org-unit represents a company department. Example: Sales Department.

A "Function" org-unit represents a job title. Example: Sales Representative.

A "Manager" org-unit represents the manager of a department. Example: Sales Manager.

A "Generic" org-unit represents a role to be played during a procedure. Examples: Writer, Approver, etc.