Duplicating a set of fields in a custom content type.

Is there a plugin where you can group a set of field, and with a duplicate button etc, duplicate the entire set of fields? Something like you would use for a slideshow. THe number of ‘slides’ is not known, but may have a max value. And each slide that is ‘duplicated’ would then not only request another image, but also an author and perhaps a title and snippet.