Adding custom fields to WooCommerce packing list

I am using WordPress with the WooComerce plug-in. I have created a custom field using WC Fields Factory for EX_Number, required by the US Department of Transportation to appear on our Packing Lists. I Need to edit the Packing List template to include an EX_NUmber column for each line item that appears on the Packing List. I find plug-ins that will let me add other WooCommerce fields in an invoice, but none that allow me to add a custom field to a packing list. Suggestions?