AnimationBehavior.Additive (PowerPoint)

Sets or returns whether the current animation behavior is combined with other running animations. Possible return values are msoAnimAdditiveAddBase - Uses the animation behavior of the base animations, msoAnimAdditiveAddSum - Adds together the animation behavior of multiple animations.

The value of the Additive property can be one of these MsoAnimAdditive constants.

ActiveWindow.Selection.SlideRange(1).TimeLine.MainSequence(1).Behaviors(1).Additive = msoAnimAdditiveAddBase