expression.MoveBefore(Effect)
expression Required. An expression that returns one of the objects in the Applies To list.
EffectRequired Effect object. The effect before which the effect in expression will be moved.
Example
The following example moves one effect in front of another one.
Sub MoveEffect()
Dim effOne As Effect
Dim effTwo As Effect
Dim shpFirst As Shape
Set shpFirst = ActivePresentation.Slides(1).Shapes(1)
Set effOne = ActivePresentation.Slides(1).TimeLine.MainSequence.AddEffect _
(Shape:=shpFirst, effectId:=msoAnimEffectBlinds)
Set effTwo = ActivePresentation.Slides(1).TimeLine.MainSequence.AddEffect _
(Shape:=shpFirst, effectId:=msoAnimEffectBlast)
effTwo.MoveBefore Effect:=effOne
End Sub