expression.OffsetX
expression Required. An expression that returns a ShadowFormat object.
Remarks
If you want to nudge a shadow horizontally or vertically from its current position without having to specify an absolute position, use the IncrementOffsetX or IncrementOffsetY method.
Example
This example sets the horizontal and vertical offsets for the shadow of shape three on myDocument. The shadow is offset 5 points to the right of the shape and 3 points above it. If the shape doesn't already have a shadow, this example adds one to it.
Set myDocument = ActiveDocument
With myDocument.Shapes(3).Shadow
.Visible = True
.OffsetX = 5
.OffsetY = -3
End With