Hi Venkatesh,
Thanks for contacting Syncfusion support.
Based on your query you need to add the DatePicker to multiple columns while editing a cell. In your update you have mentioned that you are creating columns dynamically, so before we proceed with your query we need the following details,
1. Share the complete Grid rendering code.
2. Have you not define the columns in Grid or you adding the columns dynamically in a external button click?
3. Syncfusion Package Version.
Regards,
Manivel