Is it possible to override Item name or invoice description when POSTing a combo order

Hi,

I'm successfully able to post a combo order to raise an invoice using the 'BillMe' payment method, including being able to overide the price of the item.

What I'd also like to do is be able to overide the Invoice Description and the Description showing against the invoice line.

The scenario is I need to raise an invoice for a late fee - the amount depends on the number of days late the individual is submitting an application form. What I'd like to do is have a single product "Late Fee" and then be able to overide the description on the item/invoice to say "late fee - 45 overdue" for example.

My alternative is I create a seperate product for each period they could be late, 30 days, 60 days, 90 days etc, but I'm hoping I can do so with less products.