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There are a few different options for re-adding books.
Any save to disk should save all formats of the book, together with the full metadata in metadata.opf. This includes series as well as custom columns.
When you re-import, make sure to use the second "Add Books" option (see attachment) to ensure your metadata is read from the metadata.opf and not the actual book file.
Any custom columns will be completed as well, assuming the column exists in your currently opened library.
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