Hi Yannick,
Thanks for using Syncfusion Products.
You can create row span or column span for specific Rows/Columns using CoveredCellIs in Grid.Model by giving the range of cells as CoveredCellInfo as follows,
[C#]
this.grid.Model.CoveredCells.Add(new CoveredCellInfo(0, 3, 0, 4));
we have created a sample based on your needs. Please find the sample in following location.
Sample :
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=RowColSpan-1766637092.zip Please let us know if you have any queries.
Thanks,
Thangaraj T.