sheets.rows.cells.colSpan Number (default: 1)

Sets the number of columns that a cell occupies.

Example - making a cell span over two columns

<script>
var workbook = new kendo.ooxml.Workbook({
  sheets: [
      {
          columns: [ { width: 100}, { width: 100 } ],
          rows: [
            { cells: [ { value: "Occupies two columns", colSpan: 2 } ] }
          ]
      }
  ]
});
workbook.toDataURLAsync().then(function(dataURL) {
  kendo.saveAs({
    dataURI: dataURL,
    fileName: "Test.xlsx"
  });
});
</script>