title: Jenkins dynamically put checkbox
body: <p>Let's say I have a dropdown list parameter with a few selections and I want one of the selections to bring checkboxes, otherwise they will not be shown.</p>
  
  <p>How can I do that? I tried Extended Parameter but no help, please help me.</p>
  
  <p>First selection will call another multi-choice selections (checkboxes),</p>
  
  <p>But only one selection will do that, others will not bring another selection.</p>