Linking books has been at the top of my calibre wish-list forever.
You can use calibre protocol URI's in long text columns to link related items within and across libraries. I already have a custom long text column called "Related\#related" in my major libraries.
So, I can now watch Kurosawa's Ran (or read the Screenplay/Storyboard PDF) in my Movies library via a calibre://view-book/ link in the Related custom column of King Lear in my Books library, and get back to King Lear via a calibre://show-book/ link in the Related custom column of Ran my Movies library.
Fantastic
BR
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