[Learner]

Thanks Holub for your response.One question again.
If I want to activate free shipping ="yes"by modifying the codes and applying the patches from the admin panel for a certain period( four or five days) for all uploaded products,can I able to return from present states to original states that is free shipping="no" after this period by modifying codes and patches again to "no"?

Can you help me?

Thanks to all again.