Quote:
Originally Posted by kopecky
But are there any possibility to synchronize two existing libraries?
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You can copy the custom column definitions from one library to another by copying a book between libraries.
Quit and restart calibre, selecting the library that has all the column definitions. Ensure that the "Copy to library" command is available either on the menu bar or the context menu for books in the library (Preferences / Toolbars). Next select a book and choose "Copy to Library", specifying the library that does not have the columns. You will be presented with a list of columns that are in the source library but not in the destination library. Choose the columns you want created.
Books you have previously copied will have empty values for the new columns. Recopy the books if you want the values.