If Item on Sheet Doesn't Exist in Specified Table, Add It To Table

Hello,

I have a Table on the Sheet CONTROL that contains Widgets.

There is another Sheet, called Received PT that contains a PivotTable of Widgets.

If the Widget does not exist on the CONTROL Sheet Table, but exists on the Received PT PivotTable, I would like to add the missing Widget to the CONTROL Sheet Table.

Any ideas? I am moderately stumped. and this would bring a long project to a close.