Hi Abdul,
Unfortunately it is not possible to display the sum as wanted.
When multiple columns are grouped, the Grid automatically adds Pinned columns with Toggle buttons to expand/collapse the groups. The rest of the columns which are not pinned are scrollable. Example: You have a Grid with 3 columns like in our Grouping demo and grouped the Grid by City, Company Name and Country. The Grid will have 6 columns – 3 with Toggle buttons and 3 with data. Scrollable will be only the columns with Data.
Best Wishes,
Mariya
jQWidgets Team
http://www.jqwidgets.com