Can I "reset" the progress bars in the Tivo Menu?

After you watch a show there is a blue "progress bar" next to the title letting you know if you stopped watching in the middle or finished at the end. Is there any way to reset that bar either individually, at the folder level, or on the whole machine (folder level would be the most preferred).

My son uses it to know if he's watched an episode or not. But once he watches them all what do we do?

thanks