Just sort the records based on the break field using the Sort Records script step.
That gets me partway there....
The break field is "buyersAgent".
I can group by that, since it's not a summary field.
I then want to reorder based on who sold the most (sub-summary field): totalSold
I need the script step which will do that sorting.....
Perfect, thanks. I was using sort records by field which does not have that option.