Jimmie,
I doubt that such an add-in exists. I think Harald was suggesting the
creation of such a beast.
I guess one easy way would be to create sheets tied to a 'parent' sheet that
are all hidden until the parent is activated. The problems arise when you
unhide such sheets, they would just appear as normal tabs on a workbook.
Then there are considerations such as using VBA such as Worksheet.Parent.
Normally this gives you the Workbook object, but this would be nice if it
gave the 'parent' worksheet. These are just a few things to consider, there
would be many more.
Overall, it would take some thinking about, a good design, and a lot of
development. Whilst it is a neat idea, I doubt that the demand would warrant
the effort.
