How do I add a description column to a Pivot Table

Assuming the attached image is suitable for your format, do the following:

1. Convert your data into 2 columns (with column names at top).
2. Create a pivot table containing your 2 columns of data.
3. Drag the data field names into the row label section.
4. Right-click on the pivot table and select Pivot Table Options, select the Display tab, select the checkbox Classic Pivot Table layout, click on OK
5. Right-click on the first column and deselect Subtotal Model Number (or whatever the name of your first column is

I deselected the blank value in the first column list to clean up the table