How do I add a horizontal line between products on my packing slip?

You can add some styling to include separator lines between items on your packing slip, similar to this:

Packing Slip with horizontal lines between the listed products.
  1. Add the following code to the beginning of the Order Header section:

    <style>
     table.footer {
         border-top:solid 0px #707070;
     }
     table.line-items tr td {
         margin-top:0.1in;
         padding: 0.1in 0in 0.1in 0in;
         border-bottom:solid 1px #707070;
     }
     </style> 
  2. Click Save.