jQuery SlideDown next row by row

1) INPUT BOX 1     AMOUNT       INPUT BOX2

[Add More .] when click this button should slidedown like below

1) INPUT BOX 1     AMOUNT       INPUT BOX2

2) INPUT BOX 3     AMOUNT       INPUT BOX4   (x)  (close button)

[Add More .] when clicked again slideDown to 3rd row.

1) INPUT BOX 1     AMOUNT       INPUT BOX2

2) INPUT BOX 3     AMOUNT       INPUT BOX4   (x)  (close button)

3) INPUT BOX 5     AMOUNT      开发者_Python百科; INPUT BOX6   (x)  (close button)

[Add More .] when clicked again slideDown to 4th row.

when click close that row should slideUp.