Hello,
Just like the one I replied to before this, you can use a combo of Javascript and PHP. OnChange is a popular event to do this. Pass the parameter according to the selection made, and retrieve the information ("Ship to:") and display it. Alternatively, you can choose to have all the Ship To info loaded onto JavaScript and switch it after the page is loaded, depending on which combobox item is selected. That way, you don't have to load the page again when the selection is made. Whichever suits your needs better, I guess.