'Sending' and 'Displaying' are two completely different things. You can display the combobox on next page without sending data, by just copy/paste the combo box code on page no2.
Sending means exatly what you would do when you fill a form for an e-mail - only the entered or selected value will be sent for processing on the other side.
Please explain what do you want to achieve - only list once again all values and make them available for further selection in the combo box, or, you want to show only selected items as values?