Dear,

I was trying to change the header and footer of Package Slip PDF, but unfortunately I cannot find the page for PDF Settings to add header and footer.
Kindly help me to find the page to customize pdf for packaging slip. Version of Grandnode is 4.6

If you would like to customize the appearance of the packing slips PDF, you should definitely look at the PDF Invoice & Packing Slip generator plugin. It gives you almost unlimited possibilities in the case of PDF customization.