Question

what value will appear on its on under this field whenever a new row of data is inserted in the table ​

Answer 1

The Field List should appear when you click anywhere in the PivotTable. If you click inside the PivotTable but don't see the Field List, open it by clicking anywhere in the PivotTable. Then, show the PivotTable Tools on the ribbon and click Analyze> Field List.

The Field List has a field section in which you pick the fields you want to show in your PivotTable, and the Areas section (at the bottom) in which you can arrange those fields the way you want.