create another selec t list:
<select name="ccTo">
<option value="sales@domain.com">Sales</option>
<option value="service@domain.com">Service</option>
<option value="support@domain.com">support</option>
</select>
and edit line 30 of the WA_Universal_Email/WAUE_contact_1.php file:
$WA_MailObject = WAUE_AddCC($WA_MailObject,"".($WAGLOBAL_Contact_Email_CC) ."");
to:
$WA_MailObject = WAUE_AddCC($WA_MailObject,"".(isset($_POST['ccTo'])?$_POST['ccTo']:"") ."");