In a blank document, create the content that you want the AutoCorrect entry to insert. Select it. Click File tab | Options | Proofing | AutoCorrect Options. On the AutoCorrect tab, you'll see the selection highlighted in the "With" box. Select "Formatted text" if it isn't already selected. Type in a trigger for the entry in the "Replace" box, and then click Add.

Note that formatted AutoCorrect entries are stored in the Normal template.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional