Give it a shot, and let us know how you fare.
No seriously, that's something you can easily experiment with
yourself, and see if you like the results. Perhaps that would trigger
a more specific question for this newsgroup.
If you mean can you put a tab control within another tab control, well not
directly, but you can place a subform on a page of the outer tab control,
and add another tab control to the subform.
If you mean can you put a tab control within another tab control, well not
directly, but you can place a subform on a page of the outer tab control,
and add another tab control to the subform.