Entity form reusable form part I am creating more than 50 entity forms and major parts (contains 20 fields) of these forms are exactly same. Forms are different from each others only one or two field. If I need to edit major and exactly same part of these forms I must repeat editing process for all forms. Are there any aproach to solve this problem? I need edit major part of forms only one time.
Entity forms, also know as Reusable forms, because they are not created directly in the process but in the entity that contains their information, that is, in the Context entity.

Now you please take a look at "Reuse of field collection entity type on more than one collection field?", a drupal community question explains something about it(google for it). 
I hope this would help though.

Thank you.