[QUOTE=Lukusaukko;4303248]I'm able to drag & drop books into my custom Status category, so it should work - though Calibre is sometimes a bit picky about how you do it, because depending a bit on how you click the book, it can start editing the entry or selecting many. But drag and drop definitively works.
Thank you for your time and helpful advice, @Lukusaukko! I have updated Calibre and in the latest version the drag and drop works. Much better than before. I would prefer a different workflow, but this will do.
many thanks!
P