Add line af product item on packing slip

[TONZR]

Hi,

How can I add a horizontal line foreach product item for the packing slip pdf? So it's easier to get an overview.

Sincerly,

Daniel

[TONZR]

Ok I have now found a solution - But the change will be overridden when i update magento right? So how do I make it into a extension? Anyone? 

[Rakesh Jesadiya]

You need to just use override your base Class into your custom module. using di.xml you can override your existing class and keep your class inside your module and do modify what you need.