Source inspection parts for stock

A hypothetical GSI order requires six widgets to build. Our widget supplier receives a delegation for GSI on the widgets. We build this equipment all year long and end up buying over 500 widgets a year. Our supplier offers a huge discount if we place an order for 500 vice mulitple orders every week for six, twelve, etc.

Can we buy 500 widgets under a PO that requires six and transfer the remaining 494 to stock as parts that have been through GSI?

Is there an alternative method that allows us to stock parts that require source inspection?

The Government saves tremendously on cost and schedule.