You can change the display format of Order Lines like there:
You have to set it on each State - so you would need to have it on New and Submitted order states.
You can use most relevant printer tags but you may need to use double {{ for example {{BARCODE}}.
For example, this is something I have used before (I have custom product tags for Item Number and Chinese Name):
{0}<br/><size 16><color Blue>{{ITEM TAG:Item Number}}</color> {{ITEM TAG:Chinese Name}}</size>
which will give you a result like this:
@kalvintan just wondering though, are you using {BARCODE} to store something else as I can’t imagine why you would want to show a barcode there. If so, I’d suggest using custom product tags instead.
