change an invoice line to not invoice

We recently went through a change and split one OU into 2.  We have orders in OU #1 that were fulfilled, but were put on invoice hold.  We then created Bill only orders in OU #2 to bill the customer.

Now we need to close the orders in OU #1.  How can we close but not invoice the customers.  These lines have already been ship confirmed.

Thank you,

Cindy