So I need to clarify further -- the reason for using the "SKU" field is when I initiate an invoice for our services each line on the invoice must also have a specific "ID Code". I cannot use the "Description" field because I need that for something else! 

My end goal is to be able to export to Excel so I can match the "ID Code" (or SKU) to something within our workflow process.

BUT I don't see the SKU on the invoice.  If you have a better idea of how to handle it, let me know!!  Or need further clarification