If your groups will be spanning years, you'll need to add year to the formula. In order to get the sort order right, year needs to be first and you'll convert the whole thing to a string. It looks something like this:
To_Text({table.field}, 'yyyyMM')
Please note that the format string for dates is CASE SENSISTIVE - the 'M' must be a capital M to get the month, lower case gives you minutes.
-Dell
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