Hi @dsteam,
The easiest way is to purchase our PDF Invoices & Packing Slips Bundle. With this you would get access to our Pro version that lets you change the document title from within the settings. And you get access to our Customizer through the Premium Templates extension. This lets you add all kinds of order data and you can choose any label you like.
To achieve the same with our free version you will have to create a custom template and add filter to your functions.php. This requires soms coding skills.
First create a custom template. Here you can find how: Creating a custom template
You then have to change this line in all the documents you would like ‘Discount’ to be changed:
<th class="description"><span><?php echo $total_data['label']; ?></span></th>
And change it to this:
<th class="description"><span><?php echo ($total_data['label'] == 'Discount') ? 'YOUR LABEL NAME' : $total_data['label']; ?></span></th>
After this is done you will need to add a filter to your functions.php to change the document title from ‘Invoice’ to anything you like. Here you can find how: Changing the document title
If you never worked with filters or functions.php please read this: How to use filters
I hope this helps you in the right direction!]
With kind regards,
Michael