How do i change a form dropdown based on a radio selection

Hi all,

Without meaning to call out for a script, I have a option/dropdown but if the radio selects a certain option how do i get it to alter the dropdown to a different option.

DROPDOWN BEFORE RADIO
1
2
3
4 - Manual Selection

RADIO [A] [B]

Selecting B will change the Dropdown

DROPDOWN AFTER RADIO
1
2 - Automated Selection
3
4

The closest i could come to is a radio alters another radio but i cant seem to get the dropdown to change

    <script>
    var p = document.getElementById("enterprise");
    var p2 = document.getElementById("standard");
    var p3 = document.getElementById("domainyes");
    var p4 = document.getElementById("domainno");
    p.onclick = updateRadio;
    p2.onclick = updateRadio;
    function updateRadio()
    {
    p3.checked = p.checked;
    p3.disabled = p.checked;
    p4.disabled = p.checked;
    }
    </script>

document.getElementById('dropdown').value = 2

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