Ok I edited the question with below update.
I tried with below script but it seems not working. Please someone can show me what is wrong with below code.
<script>
var myselect = document.getElementById("start2");
document.getElementById("end1").onchange = createOption()
function createOption() {
var selectEnd = document.getElementById("end1");
var value = selectEnd.options[select.selectedIndex].value;
var objOption = document.createElement("option");
objOption.text = value + 1;
objOption.value = value +1;
//myselect.add(objOption);
myselect.appendChild(objOption);
}
</script>
What I want to do is there are 2 select list form with id End1 and Start2. I want when select list End1 onchange, value from End1 will be passed to Start2 with added 1. But, it has nothing happened.