Collapsing some fields in add content page I want to use the drupal Collapse style for some fields.For example: while writing a story in my drupal 7 site, on the content publishing form user will has an option like "I want to sell this story"
Now, if the user click on it then some filed's will show-up like [Story Price] [Story License] [Topic Summary], so that they can provide all those necessary information's to sell the story. Either, if the user don't want to sell the story, they need not face those fields instead of "I want to sell this story" link! Any idea? Thanks
You could try the Field group module. You can set field group settings "collapsed" and deselect "Mark group for required fields". It collapsed the field group by default.


  Fieldgroup will, as the name implies, group fields together. All
  fieldable entities will have the possibility to add groups to wrap
  their fields together. Fieldgroup comes with default HTML wrappers
  like vertical tabs, horizontal tabs, accordions, fieldsets or div
  wrappers.