object that represents the new line.
expression.AddLine(BeginX, BeginY, EndX, EndY)
expression Required. An expression that returns one of the objects in the Applies To list.
BeginX Required Single. The horizontal position, measured in points, of the line's starting point relative to the left edge of the slide.
BeginY Required Single. The vertical position, measured in points, of the line's starting point relative to the top edge of the slide.
EndX Required Single. The horizontal position, measured in points, of the line's ending point relative to the left edge of the slide.
EndY Required Single. The vertical position, measured in points, of the line's ending point relative to the top edge of the slide.
Example
This example adds a blue dashed line to myDocument.
Set myDocument = ActivePresentation.Slides(1)
With myDocument.Shapes.AddLine(BeginX:=10, BeginY:=10, _
EndX:=250, EndY:=250).Line
.DashStyle = msoLineDashDotDot
.ForeColor.RGB = RGB(50, 0, 128)
End With