groupableBoolean|Object(default: false)
If set to true the user could group the grid by dragging the column header cells. By default grouping is disabled.
Can be set to a JavaScript object which represents the grouping configuration.
Example - enable grouping
<div id="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "productName" },
    { field: "category" }
  ],
  dataSource: [
    { productName: "Tea", category: "Beverages" },
    { productName: "Coffee", category: "Beverages" },
    { productName: "Ham", category: "Food" },
    { productName: "Bread", category: "Food" }
  ],
  groupable: true
});
</script>
Check Basic usage for a live demo.
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