By default, EVA knows a lot of fields that can be configured for organizations. You might however want to add a field that does not exist in EVA, and that is when custom fields become quite handy.
The Custom fields chapter in Admin Suite gives you an overview of all currently configured Custom fields of type OrganizationUnit as well as the option to add new, or edit/delete existing ones.
The Custom fields chapter in the Organizations module works similar to the custom fields chapter in the People module.
In order to be able to access this chapter, you need the CustomFields and CustomFieldTypes permissions.