2004 P H&B; how to zero bankrupt customer invoice

I am not an accountant, and use H&B strictly to do invoicing and to receive payments.

I have 5 invoices showing on my unpaid invoices list. The customer filed bankruptcy and I received nothing. There is sales tax involved on 4 of them. (I operate on a cash basis, paying the state when I receive the tax; none has been paid)

What is the proper way to "zero" these invoices? On another customer, when I was informed that I needed to invoice someone else, I did a credit, but the invoice still shows up on the unpaid list at $0. I'd like to have them drop from the unpaid list.

Thanks!

George