JSFiddle - React, Tailwind, and code Playground

HTML

<select name="type_id" id="type_id">
  <option value="1">Баннеры</option>
  <option value="2">Шманеры</option>
</select>
<select name="size_id" id="size_id" multiple="multiple">
  <option value="0">468x60</option>
  <option value="1">240x400</option>
  <option value="4">120x600</option>
  <option value="5">300x250</option>
</select>

CSS

select option[disabled] {
    display: none;
}

JavaScript

var type_id = document.getElementById("type_id");

type_id.onchange = function ()  {
  if (type_id.options[type_id.selectedIndex].value == '2')   {
      var sel = document.getElementById('size_id');
      sel.options[1].setAttribute('disabled', true);
      sel.options[3].setAttribute('disabled', true);
    }
  };