How to add A drop-down list located outside a form (but still a part of the form)

Select Example.

index.html

Example: HTML

 <form action="/action_page.php" id="carform">
  Firstname:<input type="text" name="fname">
  <input type="submit">
</form>

<select name="carlist" form="carform">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

Output should be:

Type:	html
Category:	Web Tutorial
Sub Category:	HTML Attribute
Uploaded by:	Admin