We unfortunately cannot provide you actual code to solve your problem. That's outside of the scope of our support. However, we do strive to point you in the right direction -hopefully with the answers that you need. Please review the following links below. I did some researching in the Drupal forums, and it does appear that some people have had the same question and have provided their answers:
Drupal Forum Question about Sub Tabs
Drupal Forum - Explanation on User Tabs (note links)
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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