Hi,
There's no inbuilt functionality similar to the Grouping for rows and columns that you describe. You could however have macros do the same thing. Something like
And a similar one for unhiding the sheet with .Visible = True
This uses the sheet code name and assumes they are Sheet1, Sheet2..etc. You will probably need to change the loop counter to say 2 to 13. etc.
For the future however, are you really sure you need separate sheets for each month. Why not consider a single sheet but with an extra column to hold the month reference? Then you can use Data Filter to view your data and you will simplify immensely any reporting you want to do across months. And you'll also open the whole world of Pivot Tables which will let you summarise and analyse in ways you've not yet thought of.
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