Hi Vigneswaran,
Thanks for contacting Syncfusion support.
Based on your shared information we unclear about your exact requirement at our end. So, before proceeding this please share below details then only we provide the appropriate solution as soon as possible.
1. Share your exact requirement briefly.
2. What you meant that different columnSources for child elements ?
3. Share UI representation of your requirement
Please get back to us, if you need any further assistance.
Regards,
Thiyagu S