I've done some searching and think I may have fallen into the terminology problem - what I'm searching for is called something different in FMP than what I call it.
What I need to know is how to set up a drop-down list, so that the user can select more than one option for storage in the field data. For example, a product may belong to one or more Categories, and I want it to display under each selected Category in a sorted list.
I'm used to calling these multi-value fields - what are they in FMP? And how do I create one?
(As part of my learning curve, I'm trying to modify the Product Catalog starter to allow for multiple categories per product, so examples based around that would be much appreciated.)