Selection.Orientation Property (Word)
Returns or sets the orientation of text in a selection when the Text Direction feature is enabled. Read/write WdTextOrientation.
Some of the WdTextOrientation constants may not be available to you, depending on the language support (U.S. English, for example) that you’ve selected or installed.
You can set the orientation for a text frame or for a selection that happens to occur inside a text frame. For information about the difference between a text frame and a text box, see the TextFrame object.