This one took a while to hit the Feature of the Day: Inactivate Item/Site . The ability to inactivate an item or site is a feature that get’s great reviews when I show it off.
Feature of the Day: Inactivate Item/Site – Inside Microsoft Dynamics GP – Site Home – MSDN Blogs
Sales, Purchasing & InventoryTips & Hidden FeaturesMicrosoft & the GP Ecosystem
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.