指定列の合計値を取得する

DATAGRID_SUM(dataGrid, column)

/* 使用例 */
payment_sum = DATAGRID_SUM(dataGrid, 'payment');

https://go.documentation.sas.com/doc/jp/edmcdc/v_056/edmdatagrids/p1du23931dz4tgn1vdf3ahx05qbe.htm