combos in a tabular structure

Could you please guide me to a solution, if you had the combos in a tabular structure where the rows could be added dynamically. And it would work for all the rows irrespective of the order you chose to select in any of the rows.

You can use the grid with co|coro or combo column type - such column types represent select box as cell edtitor or dhtmlxCombo in case of combo column type.
    dhtmlx.com/docs/products/dhtmlxG … _selectbox