JSFiddle - React, Tailwind, and code Playground

HTML

<script>
	function goToNewPage()
  {
    var url = document.getElementById('store').value;
    console.log(url);
    if(url != 'none') {
      window.location = url;
    }
  }
</script>

<form id="formname" name="Sate-Store">
	
					<select name="state" id="state">
						<option value="">Select state</option>
						<option value="ma">MA</option>
						<option value="me">ME</option>
						<option value="nh">NH</option>
					</select>
					<select disabled="disabled" class="subcat" id="store" name="store">
						<option value>Select a store</option>
						<!-- MA -->
						<option rel="ma" value="ma_store_1">MA Store 1</option>
            <option rel="ma" value="http://www.google.com">MA Store 2</option>
						<option rel="ma" value="ma_store_3">MA Store 3</option>
						<option rel="ma" value="ma_store_4">MA Store 4</option>
						<option rel="ma" value="ma_store_5">MA Store 5</option>
						<!-- ME -->
						<option rel="me" value="me_store_1">ME Store 1</option>
						<option rel="me" value="me_store_2">ME Store 2</option>
						<option rel="me" value="me_store_3">ME Store 3</option>
						<option rel="me" value="me_store_4">ME Store 4</option>
						<option rel="me" value="me_store_5">ME Store 5</option>
						<!-- MH -->
						<option rel="nh" value="nh_store_1">NH Store 1</option>
						<option rel="nh" value="nh_store_2">NH Store 2</option>
						<option rel="nh" value="nh_store_3">NH Store 3</option>
						<option rel="nh" value="nh_store_4">NH Store 4</option>
						<option rel="nh" value="nh_store_5">NH Store 5</option>
					</select>
          <input type=button value="Go" onclick="goToNewPage()" />

	</form>

CSS

.subcat option{
    display:none;
}

.subcat option.label{
    display: inline;
}

JavaScript

$(function(){
    
    var $cat = $("#state"),
        $subcat = $(".subcat");
    
    $cat.on("change",function(){
        var _rel = $(this).val();
        $subcat.find("option").attr("style","");
        $subcat.val("");
        if(!_rel) return $subcat.prop("disabled",true);
        $subcat.find("[rel="+_rel+"]").show();
        $subcat.prop("disabled",false);
    });
    
});