Custom Email Subject

"Text [submission:values:field_set_key:field_key:nolabel] More text"
** nolabel is an optional, indicate "Do not show Label"
=> Purchase Request - [submission:values:item_information:item_title:nolabel]

References:

• Drupal: How to customize the subject field with form component values [1]
• Bohemian Blog: Drupal Webform Module: How To Customize the Subject Line
• Drupal Upgrading from Webform 3.x to 4.x [2]