Hi, I have some information for different years and different months. To manage these sheets easier, I want to merge different sheets of months for every year in one group. For example, I make a pic with Photoshop to clear what I want, so I can have two pan: one for different years and other for different months of the opted year. For April 2014, I should click on 2014 and the click on April.



I know this picture is fake and in normal situation I should have these sheets in Excel like the second picture; but is there a way to manage sheets like this? If not, what can you propose to manage some sheets.

Thanks for any help

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