Using Morph Target in ZBrush Sculpting is a wonderful way to aid sculpting. Clicking StoreMT in Morph Target panel will save the state of the model. You can return to the original state by clicking Switch or by brushing in some parts of the model using Morph brush or Morph_Spray1 brush (I found this in free eat3D tutorial ).
This can be also used with surface noise as this allows the effect to be partially erased or diminished. It’s great way to control any sculpting or effect you applied to the model.
I forgot to mention in the video that you can also control length of the effect by using sliders such as Morph, Morph Width and Height.