Hi Santhosh,
Thank you for using Syncfusion products.
We suggest you to add the combo column using the ItemTemplate in QueryCellStyleInfo event add bind with the datasource for the same. So that you will get the Product information in the combo column. While getting the product information pass the companyId in the function and fetch the related records from it.
Please refer the link below for adding ItemTemplate in the QueryCellStyleInfo event:
http://help.syncfusion.com/ug_74/gridweb/CreatingTemplates.htmlLet me know if you have any queries.
Regards,
Jaffer.B