Nesting of tabs within quicktabs is it possible to create new tabs and place them under quick tabs, i.e, i want to create two new quick tabs and add them under (nesting structure) already existing three quick tabs...How can i achieve this
If I understand your request well, I think this is the solution supplied by @monymirza. But in the latest stable version of quicktabs you have the possibility to select quicktabs to be show under a tab.

Checkout this image to see : (ab is a quicktab instance that has been created earlier, and c is the parent tab that will contain ab)