Essentially what I want can be shown in outline form:

I. Stats (workbook)
A. 2009 (worksheet)
1. Jan (worksheet that appears only when 2009 worksheet is clicked)
2. Feb (worksheet that appears only when 2009 worksheet is clicked)
B. 2010 (worksheet)
1. Jan (worksheet that appears only when 2010 worksheet is clicked)
2. Feb (worksheet that appears only when 2010 worksheet is clicked)

I was hoping there was a way to have one workbook that displays only the years (2009, 2010) as worksheet tabs but once clicked, would reveal 12 nested worksheets (one for each month). Once a different year worksheet was clicked, the month worksheets currently displayed would hide again.

Thanks