Quote:
Originally Posted by whizbo
Sometimes I want to reconvert a book, How do I get the old version removed entirely from Calibre. Calibre asks if I want to add the book even though it is already in the program. If I say yes, it adds the book. What happens to the other book? How do I tell one version from another?
Hope this makes sense. Any help will be appreciated.
Thanks
whizbo 
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Unfortunately, it didn't make sense to me.

Are you asking about converting to another format? The basic process is to start with a book in calibre, then convert it. You don't need to get an old version removed. It shouldn't be trying to "add" any book. What is the "other book" - the original format?
More info is needed to help you.