Multiple transformations can be added to Layer Groups and to Sources. This is referred to as Transformation Stacking. The transformation stack is processed from the top downwards – thus the order they are added to the transformation list is important. From the moment a transformation is added, two sets of add buttons are shown, one for adding global transformations and one for adding local transformations. Consider this as simply adding them to the top of the list, or the bottom. Transformations can be removed from the stack with the red ‘trash bin’ icon.