To achieve the desired functionality you need to add the FormatStrip functionality as a new tool in the editor. For more information please refer to the following article: Custom Tools
The RadEditor control in Sitefinity is declared in the ControlPanelInsert.ascx
control templates located in \[YourProject]\Sitefinity\Admin\ControlTemplates\[ModuleName]
. If you open these files, you will notice that we already use some custom RadEditor tools and dialogs (for example InsertLink
Also, could you provide us with a sample .doc file containing the text (with the formatting) that you want to paste in the editor? This will help us to resolve potential issues with the existing "Strip Word Formatting" option.
All the best,
the Telerik team
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