Hi Diego,
Thank you for contacting Syncfusion support.
We have analyzed on your query and you can achieve your requirement by custom grouping. We have prepared a sample based on your requirement and attached in the below sample link, please refer it. In our sample we have grouped the records based on EmployeeID column. If your requirement is differ from this, please share more details regarding your requirement that would be for helpful for us to provide better solution to you.
Sample link: http://www.syncfusion.com/downloads/support/directtrac/118060/CustomGrouping-906644485.zip
Please let us know if you require further assistance.
Thanks,
Ashok
