This example demonstrates how to export table with row detail information to an excel file.
\koolreport\excel\Table::create(array(
    ...
    "rowDetailTable" => function($row) {
        return 
        [
            [
                [
                    "cellValue" => $row["productName"] . " : " . $row["dollar_sales"],
                    "rowspan" => 3,
                    "colspan" => 2,
                ],
            ],
        ];
    }
));
 
                    
            <?php
require_once "MyReport.php";
$report = new MyReport;
$report->run()->render();
             
                    
            <?php
require_once "../../../load.koolreport.php";
use \koolreport\processes\Map;
use \koolreport\processes\Limit;
use \koolreport\processes\Filter;
use \koolreport\cube\processes\Cube;
use \koolreport\pivot\processes\Pivot;
class MyReport extends koolreport\KoolReport
{
    use \koolreport\export\Exportable;
    use \koolreport\excel\ExcelExportable;
    use \koolreport\excel\BigSpreadsheetExportable;
    function settings()
    {
        return array(
            "dataSources" => array(
                "dollarsales"=>array(
                    'filePath' => '../../../databases/customer_product_dollarsales2.csv',
                    'fieldSeparator' => ';',
                    'class' => "\koolreport\datasources\CSVDataSource"      
                ), 
            )
        );
    }    function setup()
    {
        $this->src('dollarsales')
        ->pipe(new Limit(array(10, 0)))
        ->pipe($this->dataStore('sales'));
    }
}
             
                    
            <?php
use \koolreport\datagrid\DataTables;
?>
<div class="report-content">
	<div style='text-align: center;margin-bottom:30px;'>
        <h1>Excel Row Detail Table</h1>
        <p class="lead">Exporting excel table with row detail table</p>
		<form method="post">
			<button type="submit" class="btn btn-primary" formaction="export.php?type=excel">Download Excel</button>
			<button type="submit" class="btn btn-primary" formaction="export.php?type=bigspreadsheet">Download Big Spreadsheet</button>
		</form>
	</div>
	<div class='box-container'>
		<div>
			<?php
			DataTables::create(array(
				"name" => "rowDetailTable",
				"dataSource" => $this->dataStore('sales'),
				"columns"=>array(
					"customerName",
					"productLine",
					// "productName",
					// "dollar_sales"=>array(
					// 	"type"=>"number",
					// )
				),
				"rowDetailData" => function($row) {
					return $row["productName"] . " : " . $row["dollar_sales"];
				},
				"onReady" => "function() {
					rowDetailTable.on( 'draw', function () {
						KRrowDetailTable.expandAllRowDetails();
					} );
					KRrowDetailTable.expandAllRowDetails();
				}",
				"width" => "100%"
			));
			?>
		</div>
	</div>
</div>
             
                    
            <?php
    $sheet1 = "Sales by Customer";
?>
<div sheet-name="<?php echo $sheet1; ?>">
    <div>Orders Table</div>
    <div>
        <?php
        \koolreport\excel\Table::create(array(
            "dataSource" => $this->dataStore('sales'),
            "columns" => [
                "customerName", "productLine", 
                // "productName", "dollar_sales"
            ],
            "rowDetailTable" => function($row) {
                return [
                    [
                        "",
                        "",
                        [
                            "cellValue" => $row["productName"] . " : " . $row["dollar_sales"],
                            "rowspan" => 3,
                            "colspan" => 2,
                        ],
                    ],
                ];
            }
        ));
        ?>
    </div>
    
</div>
             
                    
            <?php
include "MyReport.php";
$report = new MyReport;
$report->run();
$exportType = $_GET["type"];
if ($exportType === "excel") {
    $report->exportToExcel('MyReportExcel')->toBrowser("MyReportExcel.xlsx");
} else {
    $report->exportToXLSX('MyReportExcel')->toBrowser("MyReportBigSpreadsheet.xlsx");
}
             
                    
            
    
                
                        
            | customerName | productName | productLine | orderDate | orderDay | orderMonth | orderYear | orderQuarter | dollar_sales | 
        
                        
                        
                                        | Vitachrome Inc. | 1937 Lincoln Berline | Vintage Cars | 2003-01-10 00:00:00 | 10 | 1 | 2003 | 1 | 3726.45 | 
                        
                                        | Vitachrome Inc. | 1936 Mercedes-Benz 500K Special Roadster | Vintage Cars | 2003-01-10 00:00:00 | 10 | 1 | 2003 | 1 | 1768.33 | 
                        
                                        | Baane Mini Imports | 1952 Alpine Renault 1300 | Classic Cars | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 5571.8 | 
                        
                                        | Baane Mini Imports | 1962 LanciaA Delta 16V | Classic Cars | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 5026.14 | 
                        
                                        | Baane Mini Imports | 1958 Setra Bus | Trucks and Buses | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 3284.28 | 
                        
                                        | Baane Mini Imports | 1940 Ford Pickup Truck | Trucks and Buses | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 3307.5 | 
                        
                                        | Baane Mini Imports | 1926 Ford Fire Engine | Trucks and Buses | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 1283.48 | 
                        
                                        | Baane Mini Imports | 1913 Ford Model T Speedster | Vintage Cars | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 2489.13 | 
                        
                                        | Baane Mini Imports | 1934 Ford V8 Coupe | Vintage Cars | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 2164.4 | 
                        
                                        | Baane Mini Imports | 18th Century Vintage Horse Carriage | Vintage Cars | 2003-01-29 00:00:00 | 29 | 1 | 2003 | 1 | 2173 |