Chris, to clarify what you require. If your dropdown box has an entry, e.g. "Bacon, Eggs and Hashbrowns", and you want it to appear on 2 lines, the first line being "Bacon, Eggs" with the second line being "and Hashbrowns", e.g.:
Bacon, Eggs
and Hashbrowns
I have created a script on the change event function. I created this for Designer 7.1.2 for use in Reader 7.0.9, Reader 8.1.2, and Acrobat Pro 7. I don't know if it will work if created in LiveCycle ES.
Is this what you need?