Currently, we're unable to print a packing slip that filters the items from the sales order. You can reach out to your accountant to see they have a way of doing this through QuickBooks.
I'd also recommend sharing your ideas with our Product Development Team. They'll put your suggestions into consideration for future product updates. You can submit your suggestion by clicking the Help menu at the top and selecting Send Feedback Online (Product Suggestion).
Let us know if you need anything else.