Hi,
To customize the menus - such as 'removing resolve case' or 'deactive' requires custom code. You could then check the business unit of the current user and depending on the business unit show or hide items -- again, this all requires custom code.
As for renaming a business unit - this is not supported. You need to de-active the business unit and create a new one.
Alex Fagundes -
www.PowerObjects.com