Cloning a control or promotion spud means making an exact copy of the spud. The clone preserves all of the original spud's settings and styles. When you want to create an almost identical copy of a spud, cloning saves you from having to go through the spud customization process all over again. You can just tweak the few settings and styles you want to change.
https://www.trumba.com/help/publish/pub_clonespud.aspx