Tabs Within Tabs

I have a number of views with Sideview tabs that work well. In these instances the view shows the same four sets of information, one for each tab. Those are very straight forward and easy to configure.

Now I have a situation where I have four main tabs. Each main tab has four sub tabs. Something like this:

Select Tab 1
[ Tab 1 ] [ Tab 2 ] [ Tab 3] [ Tab 4]
  [ Tab 1A] [ Tab 1B ] [ Tab 1C ] [ Tab 1D ]

Select Tab 2
[ Tab 1 ] [ Tab 2 ] [ Tab 3] [ Tab 4]
  [ Tab 2A] [ Tab 2B ] [ Tab 2C ] [ Tab 2D ]

Select Tab 3
[ Tab 1 ] [ Tab 2 ] [ Tab 3] [ Tab 4]
  [ Tab 3A] [ Tab 3B ] [ Tab 3C ] [ Tab 3D ]

Select Tab 4
[ Tab 1 ] [ Tab 2 ] [ Tab 3] [ Tab 4]
  [ Tab 4A] [ Tab 4B ] [ Tab 4C ] [ Tab 4D ]

I'm not sure how they should be nested.