Corporate Divisions are a way to separate your company into pseudo companies or actual separate companies without having to have separate databases. By creating multiple corporate divisions you can separate your users, sales, costs, and even your QuickBooks company files. These divisions can be as isolated as you choose them to be.
You can assign which users have access to the division. This will allow you to share resources between these different divisions or isolate them as if they were a completely separate entity.
For each corporate division you can also specify the drop down lists associated with it. Every top level record type including: Company Locations, Contacts, Projects, Service Agreements, Serviceable Items, Service Tickets, Help Desk Incidents, Assets and Employees are assigned to a corporate division that determines which drop down lists are used.
Each corporate division can have its own QuickBooks File associated with it. When your divisions are completely separate financial entities, you can associate the division with a completely separate QuickBooks File. If your divisions are not separate financially, you can associate the same QuickBooks File to each division.