Hello Sergey,
Thank you for writing.
You can use either use
HTML view where you can use your already created tables or you can use
Column Groups View where you can create unlimited number of subgroups. Also consider the following code snippet where you can find an example of how to create ColumnGroupsViewDefinition without binding the grid to a database:
I hope this helps. Should you have any other questions, do not hesitate to ask.
Regards,
Dimitar
Telerik
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