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As far as I know, there isn't a straightforward way to do this. Tableau will let you have the highest level of column headers on the bottom (or you can force them to the top using the menu "Analysis" --> "Table Layout" --> "Advanced" and then uncheck the option for placing the highest level on the bottom). But there's not a way to force more than one level to the bottom.
However, I've attached a workbook that shows a possible workaround. This makes use of a dual axis where the second axis is fixed to allow some space at the bottom to place annotations for the months and labels for the years.
I'd be happy to answer any questions you might have!
Thanks that helps a lot. Would you happen to know of any way to standardize those annotations so that each one is the same size and in the same location?
Thanks, it is interesting, but my question is: the month label (annotations) below the bar graph are filled manually?
I would need some other technique to make it work with every dataset, without having to play with annotations :-(