PO PDF Template Conditional Regions by Purchasing Category

Summary:

We are trying to update the PO PDF template so that if 3 specific purchasing categories are used on the Purchase Order it renders some different text on the template. If any other Purchasing Category is used then some other text should be rendered instead.

We want to explore the following 2 options:

1. Check all Purchase Orders lines on the PO and if all lines have one of those mentioned categories, print the text specific to those categories only, otherwise print the other text. 
2. Check all Purchase Orders lines on the PO, if at least 1 is one of the above mentioned categories is present, print the text specific to those categories only, otherwise print the other text