Is there any ideas on webform mutile values on same field?
There is module for doing this: Try the Multivalue Settings module.


  This module adds some useful settings for fields that can contain multiple values. You can specify:
  
  
  Number of values allowed
  Number of values required
  Number of empty widgets to display initially (Drupal usually displays all fields for non-unlimited fields. This allows you to only display a few, followed by the 'Add More' button, which will disappear after the maximum number of fields has been filled.)
  Number of empty widgets to display on edit forms after the field contains some values (Drupal usually displays one extra.)