The Web application's Navigation->Bookmarks (Manage Bookmarks) function has a Tools->Import / Export function which saves as an txt/html file.

I suggest that you export the N8x0's bookmarks to a file and then port to your PC where you can cut and paste your IE bookmarks (actually IE calls them "Favorites") into the file and then bring it back to your N8x0 for importing.

To edit an html file on your PC you can use Notepad, Word, Frontpage or any other editor.