JSFiddle - React, Tailwind, and code Playground

HTML

<section>
  <div class="container">
   <select id="myId_1" name="myName_1">
     <option value="1">1</option>
     <option value="2">2</option>
   </select>
  </div>
</section>
<button type="button" id="myBtn">add</button>

JavaScript

$(document).ready(function () {
    $('#myBtn').click(function(){
      var addEvent = $('.container').html();
      
      var selectid = $('section :last-child select').attr('id'); 
      var selectname = $('section :last-child select').attr('name'); 
        
      var tempId = parseInt(selectid.split('_')[1])+1; 
      var tempName = parseInt(selectname.split('_')[1])+1; 
      var addEventCell = $('<div class="container">'+addEvent+'</div>');
        
       var newId =  "myId_"+tempId; 
       var newName = "myName_"+tempName ;
      
      var select = $('select', addEventCell);
      select.attr('id', newId).attr('name', newName);      
        
      $('section').append(addEventCell);
    });
  });