@SMNCP you will probably want a custom column on the transaction that defaults to the item custom field value. Then on your Adv PDF template you can access the custom column directly on each item line.

Thank u @NElliott

SuiteAnswers is often a good resource if you need a quick answer - there's an article covering this exact requirement - "Source a Custom Field on an Item Record and Display it on an Advanced PDF/HTML Template" Answer Id: 74744

Thank u @markderrick .