var grid1 = new WdtGrid('grid1');
    grid1.create(column, option);
    var sortColumn  = [ { id : 'company', order : 'asc'},
                        { id : 'product', order : 'asc'}];
    var groupColumn = [ { id : 'company', order : 'asc'},
                        { id : 'product', order : 'asc'},
                        ];
    grid1.setData(data);

    const mergeType = '1'; //mergeType : 0, 1, 2, 3 선택가능
    grid1.setMerge(sortColumn, groupColumn, mergeType);