expression.PageHeight
expression Required. An expression that returns a PageSetup object.
Remarks
Setting the PageHeight property changes the PaperSize property to wdPaperCustom.
Use the PaperSize property to set the page height and width to those of a predefined paper size, such as Letter or A4.
Example
This example sets the page height for the active document to 9 inches.
With ActiveDocument.PageSetup
.PageHeight = InchesToPoints(9)
.PageWidth = InchesToPoints(7)
End With