VF11 cancel a lot of invoices

I need to cancel a lot of invoices (approx 1600). What is the best way of doing this? In VF11 i can copy/paste 14 inovices, then page down, and then copy/paste 13 new. This is way to time consuming. Is there any other standard way of doing this or do I need to develop a program to be able to batch cancel all this invoices?

Kind regards