So, in the form attached, I made some guesses for the mapping - it is already added as a resource file to the form and I added the data connection for it. Since you don't have your secondary data connection in place to provide data for your list boxes, it is sort of hard to show what I mean - I removed the mapping to the Title field - I'm guessing you don't actually want to write to that in the form library, right? Just the assigned to field? I added a field for the List ID and bound your "forms" list box to that - what I'd anticipate is that for the forms box, you'd display the name or title and have the value be the ID for the form. Please keep in mind that in your form library where you want to update items, the Assigned To column must be writable from the list.