Paragraphs.IndentCharWidth (Word)

Indents one or more paragraphs by a specified number of characters.

This method is equivalent to clicking the Increase Indent button on the Formatting toolbar.

IndentCharWidth (Count)

Count: The number of characters by which the specified paragraphs are to be indented.

With ActiveDocument.Paragraphs 
 .IndentCharWidth 10 
End With