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@Havoc - there is no 'official' way.
Calibre will let you have duplicate books (ie same author and title), so you could create a column for Revision Number and sort the book list by Author (Maker), Title (Component) and Revision Number so that they would at least be grouped together.
Or, you could keep the old revisions in an archive format within the 'book'. Personally I would avoid zip and rar because calibre will under certain conditions process them as comics - so maybe 7z. You would have to open the 7z in a 7zip aware utility to read anything, or to add any additional revisions.
Or you could keep the old revisions in a 'parallel' folder structure and put a link to the old revisions folder in the Comments or (Windows Only I think) wrangle a shortcut to it in the book folder. In the latter case you would have a LNK format in the book, which when Viewed would open the relevant old revisions folder.
BR
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