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SUBMIT YOUR IDEAMy solution
Found this one very difficult, especially given the target output, which is not what I would have used/done.
I ended up creating a different output view, leaving the Category as a Column and adding the running averages as extra columns at the end.
Creating separate columns for 3M and 6M averages, perhaps I didn't understand the question?
Interesting this one and not as straightforward as I first thought.