Would like to filter the selection to a certain group id

Hello currently developing an online application system and now im in the module where the secretary would forward the applicant's information to specific board of interview panel. my code lets the secretary select from my tb_users table but i want it filtered to a specific group_id so not all users registered would show up on the selection

Here is my code used for the

$("#panelfirst").jCombo("{!! url('secretariat/comboselect?filter=tb_users:group_id:first_name|last_name') !!}",
        {  selected_value : '' });

via Chebli Mohamed