Summary: 

 To show component products for assembled products on the packing slip document.

Steps:

• Navigate to Settings > Doc Designer 
• Click on Packing Slip
• Open packing slip template
• Click on PackingSlipLinesGrid on the template preview
• Scroll and click on ComponentProducts in the Headers menu 
• Tick Visible 
• Click Save Now
• Click Publish

Additional Information:

Only Auto-assembled products in the Sales Order will show a list of their components on the Packing Slip.