Invoicing addons without displaying periods

[endreottem]

I'm trying to figure out a way to invoice an addon without displaying a period on the invoice. Does anyone know if this is possible?

 

For example, I want to send an invoice for webhosting to a customer every three months. Since the customer has chosen to receive invoices by postal mail, I want to add a fee for this on each invoice he receives. This fee is a "once per invoice" fee, so I DO NOT want the invoice to look like this:

 

Webhosting - mydomain.no (01/01/2012 - 31/03/2012) $3.00

Invoice fee (01/01/2012 - 31/03/2012) $3.00

 

..but rather something like this:

Webhosting - mydomain.no (01/01/2012 - 31/03/2012) $3.00

Invoice fee $3.00

 

Is this possible at all in WHMCS?