I've created a layout that I'd like to use sub-summary fields, the fields involved are "Year", "Month" and "Item".
The layout that I'd like to achieve is:
Year (A list of all years)
Month (A list of all Months for that year)
Item (A list of Items by Months for that year)
I've attempted to create the sub-summary fields in a layout but am unable to get the sorting correct.