If you want a form that should work properly in Word, you will have to create it in Word, for example by using content controls or using "Filling in forms" protection with legacy form fields.

Alternatively, if you just want the visual appearance of a form (no fancy stuff), you can create it with table cells. Just add and remove borders as required.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional