You can use pivot grids for multi level nested reporting needs.
[!Sale Groups:1,1,1,1,1:0]
>Group|Group Code|Menu Item Name|[N]Quantity|[C]Total
{REPORT ORDER DETAILS:MT.Group,M.GroupCode,O.MenuItemName,O.Quantity,O.ExactTotal}
You can read more about it here.
http://sambapos.com/wiki/doku.php/custom_report_pivot_table_views