Custom Edit Permissions in the form After form submission

[Mangesh_Mundhe]

Requirement is : User is allowed to submit the form first , once the user submits the form then that user should not be able to edit some of the fields from that form he is submitted earlier but he can edit other fields . But some Users with special
privilege should be able to edit the fields which are not to be edited by the user after the form submission . These people with special privilege are kept in different groups and they should be able to edit particular fields as per the group… so if say people from the Admin group can edit X and Y columns from the form after submission… then neither the normal user nor the people with special privilage from the other group than Admin group should be edit the X and Y column fields…
But when anyone who uses the app is adding record using the Form they should be able to add all the fields restrictions should be applied on at the time of editing…
Please help me to get this done