Multiple invoices on one packing slip

Multiple invoices on one packing slip

We consolidate multiple orders/invoices on one large freight shipment. Is there a way to generate packing slips by selecting invoices to go on the pack slip? Similar to receiving payment where you are presented with open invoices and you select each one
This would add to our documentation and accuracy and records. It is only natural to add an invoice to the pack slip when we have all the paperwork at the desk with a simple click on the list.

It need not be a specific form. there must be a simple work around for this.

I wonder about creating a custom field and doing a bulk update from an "Invoice" View, . But then how to get the invoices item listing on one form? Even if only the invoice was listed that would be a great start!