Mark users as VIP based on their Group

var vip_grm = new GlideRecord('sys_user_grmember');
vip_grm.addQuery('group', 'SNVIP');
vip_grm.query();
while (vip_grm.next()) {
    var vip_rec = new GlideRecord('sys_user');
    vip_rec.addQuery('sys_id', vip_grm.user);
    vip_rec.query();
    while (vip_rec.next()) {
        vip_rec.vip = true;
        vip_rec.update();
    }
}