Hello Jerome,
Thanks for the quick reply.
Re: #2:
I have a website using hikashop (business edition) for event registration. Most of the event details are custom fields and this works well, however there is a bit of a dilemma for the event teachers. The teachers are currently setup as joomla users with a 3rd party plugin that adds some extra fields to users (bio, photo, custom fields, etc). I would like to continue using joomla users for displaying teachers, so in the backend, I wish to allow event creators to use a dropdown to select the event teachers, which is populated from joomla users.
ie. Custom field "teacher" that has a multiple select dropdown. That dropdown has 1 default value ("no teacher"). When a product is being created in the backend, I wish to access joomla users, select all the teacher users and populate the dropdown custom field with their names.
I looked in the hikashop code for products form to see how you add custom fields to the product new/edit display. I could add code here to check for the custom field "teacher" and populate it with joomla users, but I was wondering if there is a better way to do this?