custom-summary
There are 2 repositories under custom-summary topic.
DevExpress-Examples/winforms-grid-calculate-custom-summary-based-on-other-summary-values
Calculate a custom total summary based on other columns' summary values.
DevExpress-Examples/winforms-grid-display-summary-calculated-over-detail-rows-in-master-row
Calculate a summary against detail rows and display it in a master row cell.