When you no longer need an approach, you can disable it. When you disable an approach it does not appear on the menu when you enter a gift, but you retain the gift history to that approach. You cannot delete an approach.
Below the Database Configuration heading, click Approaches
Click the Enabled link below the name of the Approach to disable it
When the Approach is disabled, it will appear in gray italics and you will see a link that says Disabled below the name of the Approach.