expression.OffsetX
expression Required. An expression that returns one of the objects in the Applies To list.
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 method or the 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 = Worksheets(1)
With myDocument.Shapes(3).Shadow
.Visible = True
.OffsetX = 5
.OffsetY = -3
End With