Can you be a little more specific about what you mean by 'automatically update with the entry in another field'? That could be interpreted different ways, each requiring a different solution in the PDF. Do you want the fields to share the same value? Do you need a calculated value? Do you need to set the value in field A using a matching value from the entered value in field B?
Thank you for responding.
I have actually figured out what I need to do, so I no longer need the question answered.