adding multiple selected items from a list box to a text box

I am trying to pass multiple selected items from one list box into another empty list box. I have a list box with a significant number of items in the list and want to pass the selected items into another list so that the selected items make up a new much shorter list. The form I am creating will be printed and I need all selected options in the list box to be visible - thus the new list box that is comprised of only the selected options. Hopefully this makes sense.

Any help that can be offered would be great. I have looked at a number of other examples on the acrobat users site - but have not found anything that I can make work.

Thanks