@Jane Eyre - if you save it as DOCX you can either use Sigil's DOCXImport plugin which offers the possibility of mapping the Writer Styles to ePub CSS styles, or you can use calibre conversion (or editor) to convert DOCX to ePub, which will preserve your Writer styles the ePub's CSS, but it won't retain the style names, and it will flatten any hierarchical structure.
BR
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