Hello Braulio,
Currently, grouping is not available in the Spreadsheet. There is an existing feature request for adding such capabilities, which you can vote for in our Feedback Portal: https://feedback.telerik.com/kendo-jquery-ui/1443069-provide-support-of-row-column-grouping-as-available-in-ms-excel
Regards,
Ivan Danchev
Progress Telerik
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