title: How to create dependent dropdown in drupal 7 content type?
body: <p>I have created two custom content type in drupal 7. One is <code>tourname</code> and another one is <code>location</code>. 
  I added a tour name in tour content type like tour1,tour2 and so on. And location content type as location1, location 2 and so on for each tour name. </p>
  
  <p>Now I created third content type and named it as <code>details</code> in that I need two drop down one being list of tours I have added and another one is list of locations I have inserted. Whenever I changed the tour drop down value, the second drop down value will get automatically updated based on the tour name.</p>
  
  <p>Thanks in advance.</p>