Thank you shedev.
I am expecting to see categories in the category dropdown, as in the CascadingLookup example https://plumsail.com/docs/forms-sp/how-to/lookup-cascading.html
However, when I click the categories dropdown, there are no categories. There are options in the Product.
To cover some of the basics, yes I have entered the extra fields and the Expand as per the example
I literally copied the code into plumsail from the example, because I have set these lists up in sharepoint to be the same as the example.
I'm wondering if I've missed something simple. Maybe in Sharepoint. When I setup the lookups, do I need to allow all the columns that I want to see, or just show the title?
I'm just a little frustrated with this - I was hoping that the example would help me figure out how to add additional feature that my company need.