SELECT
  qt_test.bus_unit,
  wm_concat(qt_test.sales) sales_data,
  SUM(sales) sales_totals
FROM
 (SELECT  10 as bus_unit, 2000 sales from dual UNION ALL
  SELECT  10 as bus_unit, 2500 sales from dual UNION ALL
  SELECT  20 as bus_unit, 2500 sales from dual UNION ALL
  SELECT  20 as bus_unit, 1500 sales from dual UNION ALL
  SELECT  20 as bus_unit, 1500 sales from dual UNION ALL
  SELECT  10 as bus_unit, 2500 sales from dual UNION ALL
  SELECT  30 as bus_unit, 4500 sales from dual UNION ALL
  SELECT  30 as bus_unit, 3000 sales from dual UNION ALL
  SELECT  30 as bus_unit, 4000 sales from dual
 ) qt_test
GROUP BY qt_test.bus_unit;