jQuery clone和appendTo重复错误的内容

I am trying to have a form of text inputs. All inputs will in an ordered list OL/LI structure. There will be a + symbol next to the input that when you click on it, it should create a sub-OL and make a secondary list with another input. If you click it again, it adds another input. The new inputs have + symbols as well and you can do the same thing. I only technically want it to go three deep, but I think I can figure that part out later on, but what I'm really after is how to make this happen.I am trying to have a form of text inputs. All