jomsocial group modul modification

To customize jomsocial group module. Simple list board to be displayed, this can be a list with editable headings for admin like (name, status, date from, date to, additional) This need to be show up in every group. Entry in the list should be unlimited, but after completed can't be delited or changed but should be searchable. Only person including owner of group can make entry. The admin should be able to edit, delete entry. For better understanding scenario. Logged user/member is joining or creating new group, than he press create new entry ( he is required to fill 4 required fields and 1 optional) thane new entry will be attached to the list.