Hello @terrieb 

Apologies for delay. Sample script can be as below: 

// Check if the state has changed to Closed Incomplete
    if (current.state == 'Closed Incomplete') {
        var ritm = new GlideRecord('sc_req_item');
        if (ritm.get(current.request_item)) {
            // Update the RITM state and stage if it's active or already closed incomplete
            if (ritm.state != 'Closed Incomplete' && ritm.state != 'Closed Complete') {
                ritm.state = 'Closed Incomplete';
                ritm.stage = 'Request Cancelled';
                ritm.update();
            }
        }
    }

If my response has helped you hit helpful button and if your concern is solved do mark my response as correct.

Thanks & Regards
Viraj Hudlikar.