Yeah! I am glad I finally tried this technique, it was alot easier than I ahd thought.
Stamp your image
Next versamark the area you want cracked
Then sprinkle clear embossing powder(or use glassy glaze for deeper cracks) over versamarked area and use your heat tool on it.
Do this step (versamark/ embossing powder/ heat tool) 3-4 times
Last put in Freezer for 5-10 minutes.
It really is as easy as that.