As it is necessary to send client a packing list not a delivery note, which’s not available in manager, and as a suggestion you can add a custom field option (like the one in Invoice ) which we can change the title to packing list .
Delivery notes actually began their life in Manager solely as packing lists. Later, additional functionality was included. But, if your workflow requires a packing list, you should use delivery notes. “Delivery note” is common accounting terminology internationally, but if you want to change the form title, you can do so with a custom theme. See this Guide: https://www.manager.io/guides/7877.