How to populate table rows with selected listbox items?

Hello,

I am trying to populate a table with selected listbox items. Each item should be a new row in the table. The picture below is the listbox and table I am using. I need to get the selected name to populate the Attendee column of the table when the user clicks the Add button. How do you do this with mutltiple attendees selected?

Image may be NSFW.
Clik here to view.

Thank you,

Angie