Add Instance

In the first image below the user can click on "AC" to add additional lines for comments. When they have completed that they will click on "Add Line" to add a new instance of that line. In the 2nd image the 2nd line is overwritting the additional comments add to the 1st line. How do I position line two and additional lines to occur at the bottom of the additional comments (1 comment or 5+)

Also I need two more buttons

     1. Will add line and copy the contents of the line above

`    2. Move line - Up and Down button that will allow the user to reorder the entries.

Thanks in advance for your help!