Allow a matrix row hierarchy to expand upward (standard Accounting format)

Allow a matrix row hierarchy to expand upward (requested by Accounting)

The functionality of PowerBI always expands a matrix downward, with subcategories appearing beneath the header.
Standard accounting format requires that the subcategories appear above the header.

Power BI does allow us to move row subtotals to the Bottom, displaying the word "Total" at the bottom, with the header still at the top. Accounting needs the header name at the bottom instead of the word "Total".