Hello @comet52,
Printing a packing slip will always base on the details of your invoice, not the estimate. Creating a full packing slip in progress invoicing is unavailable.
Instead, you can create an invoice with the same details of the estimate, delete it after printing the full packing slip. Here's an article you can read to learn more: Create and print a packing slip.
You can also read this helpful article in case you need some ideas in managing your sales transactions: Income and Expenses.
Fill me in if you have any other questions. Thanks for dropping by!