EPUB files are actually archives containing multiple files. The text files in the archive are (x)html files.
It is generally considered good practice for each chapter or other major segments of a book to be indivitual (x)html files in the EPUB archive. To accomplish this you could work this way:
1. Export the first chapter from Word as "Web page filtered HTML".
2. Use Calibre to convert this HTML file into an EPUB.
As you create subsequent chapters:
3. Export each as separate "filtered HTML" files from Word
4. Open the EPUB in Sigil and add the next chapter.
Sigil will build and/or update the other necessary components in the EPUB as you add successive files. You will, though, have to do some massaging of the HTML files and the CSS styles to clean up the garbage with which Word burdens its HTML files.
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