The supported actions are listed in the help article, where custom actions are not supported. Feel free to vote for the logged feature request
for such actions to raise its priority, where you can describe the business case (including details about the type of operations executed by the custom actions).
In general, the requested functionality is more suitable for a grid control. If it is an option for you, test using Telerik UI for WinForms RadGridView
which can be exported in the following formats - Exporting Data.
Also if you want to have the data visualized in a report, after the end-user is ready with the operations in the grid, you can display a report with similar layout bound to the same data. Thus the data can exported in the formats
supported by Telerik Reporting, if needed.
I hope this information helps.
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