Paragraphs.Alignment (Word)
Returns or sets a WdParagraphAlignment constant that represents the alignment for the specified paragraphs. Here you can find possible values for
Some of the WdParagraphAlignment constants may not be available to you, depending on the language support (U.S. English, for example) that you've selected or installed.
ActiveDocument.Range.Paragraphs.Alignment = wdAlignParagraphCenter