The Additional Security tab is divided into two panes. The pane on the left is the category (Additional Security) and the pane on the right is the value (Additional Security Item). You will need to have a category before you can select the value.
Example: The Kitchen Group is limited to the kitchen department. This means that a user belonging to the Kitchen Group is unable to view an employee's records for the other departments. This filter is applicable to the reports as well.

Shows the identity for adding security items to the list. This also acts as a primary key for the AddSecurityItem table.