The "*.DigiKey_bom.csv" Web Order file has 3 quantity columns

On the DigiKey website:
  My Digikey
  BOM Manager

  upload this file from the web page
  update column headings on the DigiKey form
  column 4: do not use
  column 5: Reference Designator
  column 6: Customer Reference
  column 7, 8 or 9 Quantity

Submit the form to make an order
Then you can go back and update quantities.

You can also edit the ".csv" file in a spreadsheet prior to submitting it as long as you remember to save it as ".csv" and not in ".xls" or ".xlsx" format.