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The only way in Sigil is through search&replace using regular expressions. The Book view (WYSIWYG editor) in Sigil is a lot less developed than the Code view (HTML editor).
If you can do what you want in OO, you should do so and then save as html. I just tested it with a sample and the html produced by OO is not bad. It is not perfect, but a lot better than even the filtered version of Word's html.
You can then open the html file in Sigil and go from there.
If you prefer a WYSIWYG editor, maybe you should try to do as much as you can in OO and only use Sigil to turn the html into epub and set the meta information and create the TOC as a last step.
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