Hi Rhys,
I do understand how picklist values can be mapped, but I think I was unclear in my original request. It may have already been answered, but what I want to confirm is if you can map the Hidden Form Field to a field that is a lookup to, say, another Entity in CRM. So, it isn't just a picklist of options configured on a field; rather, it is a lookup to an Entity's records.
Let me know if you need further clarification.
Thank you!
Kelsey.