Hello,

I would like to add Grouped Running Totals, by using 2 columns to calculate the running totals.

I found the post "Grouped Running Totals" ( https://www.myonlinetraininghub.com/grouped-running-totals-in-power-query), and have copied the fx and attempted to add the code for the list buffer.  But am uncertain how to create the list buffer using two columns.  In the attached example, I would like to create the running total for "Month Total", by grouping "Model" and "State".

Grateful if you could please point me in the right direction.

Many thanks, Danielle