MarginTop Property
Returns or sets the distance (in points) between the top of the text frame and the top of the inscribed rectangle of the shape that contains the text. Read/write Single.
expression.MarginTop
expression Required. An expression that returns a TextFrame object.
Example
This example adds a rectangle to myDocument, adds text to the rectangle, and then sets the margins for the text frame.
Set myDocument = ActiveDocument
With myDocument.Shapes.AddShape(msoShapeRectangle, _
0, 0, 250, 140).TextFrame
.TextRange.Text = "Here is some test text"
.MarginBottom = 0
.MarginLeft = 100
.MarginRight = 0
.MarginTop = 20
End With