Hi Benjamin,
Thank you very much for your interest on Syncfusion products.
Currently in XlsIO we do not support to auto arrange the contents in the input sheet based on the inserting value, so as a workaround we have created a sample to auto arrange by inserting the rows and columns in the sheet. Could you please try the same and let us know if this helps you.
SamplePlease let me know if you have any queries.
Regards,
Sathish