You can now register rich metadata for a variety of record types in Metadata Manager using simple, guided workflows. The tool is used by many in our community to register grant and journal article records, and it has now been expanded to support books and chapters, reports, dissertations, and post-publication updates for journal content.
This is a companion discussion topic for the original entry at https://www.crossref.org/blog/registering-rich-metadata-for-books-chapters-reports-dissertations-and-updates-just-got-easier/