To iterate upon a current idea, press the plus icon in the upper right corner of the idea view toolbar. You may copy the current idea’s layers by tapping on the layer thumbnails, or simply create an entirely new idea. Tap done to proceed or cancel to cancel the command.
To quickly iterate upon an existing idea perform a quick swipe left from the bezel, and select the layers you wish to copy. When you have the desired layers selected hit done or tap the new idea. You may now make quick copies of the idea with the selected layers by swiping left from bezel to bezel. Layers can be added or removed from the quick iteration copy by repeating the inital step.