Our Extended version of Expense Manager has the ability to handle separated user accounts so a user only sees his expenses, not the expenses of everybody using the system.
Moreover, the super user and the managers can view all users expenses if he/she desires and filter them by their creator.
The option by default is that registered users can create, edit all items they see, and view their items. The super user and managers can create, edit and view their items and all other users items. But this feature is customizable.
You can give or remove privileges to Joomla groups with our ACL system.