To sort a pivot table by subtotals, you can follow these steps:

1. Click on any cell within the pivot table.
2. In the "PivotTable Analyze" or "Options" tab in the ribbon, click on "Sort & Filter" and select "Sort Largest to Smallest" or "Sort Smallest to Largest" depending on your preference.
3. In the "Sort By" drop-down menu, select the column that contains the subtotals you want to sort by. In your case, this would be the column with the subtotal for each name.
4. Click "OK" to apply the sorting.

This should sort the pivot table by the subtotals for each name, with the names with the greatest number of units appearing at the top.

If you want to drill down and display the details for a specific name, you can double-click on the subtotal for that name. This will create a new sheet with a detailed view of the data for that name. You can then sort and filter this data as needed.