How do i create nested tabs in drupal 7 view?
You could use Quick Tabs Module along with Views Module to achieve this result.

A simple overview to achieve this might be:


  Since Quicktabs uses blocks as tabs, If you create a views blocks for each
  single items of a content type and then add them to quick tabs
  manually.


Look through this http://mtt.desk.com/customer/portal/articles/992921-how-to-add-quick-tabs-with-multiple-view-blocks-inside-a-specific-page to get an idea.