It's not exactly a simple process, but with the help of the examples in the Domino Designer Help database, you can use the new NotesRichTextTable and NotesRichTextNavigator classes to add and modify the rich text table and the data in the table.
It is important to note that changes to rich text fields are not available until the document is saved, closed and re-opened. You can do all of this in your script (provided that the script is in an agent and not embedded directly on the form) and it should be fast enough that the user can't even tell what happened.
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This was first published in September 2005