Resolved! select a group in assignment group field so in assigned to only particular grpmemebr see not all us
var grUser = new GlideRecord("sys_user_grmember");grUser .addQuery("group", current.u_assignment_group);grUser .addQuery('user', '!=', current.u_assigned_to);grUser .query();var querStr = '';while (gr.next()) {if (querStr == '') {querStr = 'sys_idIN...