jQuery Dynamic Form

Need a dynamic jQuery form that adds new form elements based on the rules below. Example: 1. Instructions 1a. Fun Fact 1b. Point of Interest 1c. Destination Point Rules: 1. If user clicks add new instruction (#1) a new block will be created (#2). 2. The sub items (1a - 1c) are available to add but not shown by default. User must click add X to add it to #1. 2. User can add additional sub items. Clicking on 1a will create another Fun Fact for #1. 3. User can delete any item added sub items. 4. User can main instructions and sort sub items by click and drag. 5. All items must be posted into an indexed PHP array based on the instruction number and sub items as sub arrays.