JSFiddle - React, Tailwind, and code Playground
HTML
<select id="selAvailable" size="10" style="width:250px" multiple="multiple" ondblclick="selectRow(this,selSelected)">
<option value="40202">40202</option>
<option value="9999999">9999999</option>
<option value="aasddasdas">aasddasdas</option>
<option value="Admin-agency">Admin-agency</option>
<option value="Agency-ABC">Agency-ABC</option>
</select>
<select id="selSelected" size="10" style="width:250px" multiple
ondblclick="selectRow(this, selAvailable)">
</select>
JavaScript
function selectRow(selectFrom, insertTo) {
var selectedValue = selectFrom.options[selectFrom.selectedIndex].value;
var insertHere = document.getElementById($(insertTo).attr("id"));
var option = document.createElement("option");
//--add to Selected Agencies
option.text = selectedValue;
insertHere.add(option);
$(insertTo).change(selectedValue);
//--remove from Available Agencies
selectFrom.remove(selectFrom.selectedIndex);
}