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There is not going to be any support in calibre for cross record links. IMO the increase in complexity is not worth it. Simply use a custom column or a tag and set it to the same value for all the books you want to link. You can have n tags to express n relationships. You can even have the books in an relationship ordered in a particular order by using a custom series column for this.
Similarly, adding support for author metadata, i.e. describing the role of every author of every book is more complication than it is worth. You can add a note tothe comments field about the role of the individual, but there is not going to be database level support for it.
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