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I'm not sure what you're trying to achieve. But certainly, if you're using the Tools > Table of Contents > Edit Table of Contents procedure, you cannot select multiple entries at once.
But, even so, that is the most reliable way of editing a ToC because Sigil will then make the needed changes to the ncx or nav files. Thus avoiding the errors which (as you seem to have found) direct editing of those files can so easily cause.
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