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Have you looked at the 'import files' selection in the main songs library. It may work by importing the new book into a file on the tablet first then using this function to import and modify the songs by checking the 'update songs if matching files are found' and , maybe, 'scan all subdirectories for files' and 'populate metadata from directories' [uncheck 'avoid duplicate songs']. Rename the collection by long pressing the collection name.