After ordering any product from store in backend page admin can check the packaging slip details of order product & can also print the packaging slip.
Firstly go to woo commerce all orders,edit the ordered product then you can see payment details & along with that packaging slip details & also can print the slip.
Image 1 : Shows the details of orders.
Image 2 : Details of order.
Packaging Slip Templates
Image 3 : Template 1
Image 4 : Template 2