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In Bulk metadata edit S&R, if you set Mode to Regular expression it provides distinct Source and Target columns - e.g. extract from Title and append to Author.
But if the metadata is embedded in the Epubs, its not too late to extract it from them. Simple test: select a book, go into metadata edit, in the Basic metadata tab, select the Epub in the formats panel (top right) press the lower icon on the left (pencil on pad).
If the metadata changes then you can do the same thing en masse by selecting all the books and then use bulk metadata edit - there's a checkbox labelled: Set metadata (except cover) from the e-book files.
Probably worth taking the time to backup up the library before doing any bulk changes - there's no easy way to rollback.
BR
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