Close all child cases from Parent Case

Client-Side Components/UI Actions/CloseChildCases/CloseChildCases.js

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+(function executeAction() {
+    var grCase = new GlideRecord('sn_customerservice_case');
+    grCase.addQuery('parent', current.sys_id);
+    grCase.query();
+
+    var counter = 0;
+    while (grCase.next()) {
+        if (grCase.state != 3) { // 3 = Closed
+            grCase.resolution_code = '16';
+            grCase.close_notes = 'This case was auto closed from the parent case.';
+            grCase.state = 3;
+            grCase.update();
+            counter++;
+        }
+    }
+
+    //  Show info message only if any cases were closed
+    if (counter > 0) {
+        gs.addInfoMessage(counter + ' child case(s) have been closed.');
+    }
+
+    action.setRedirectURL(current);
+})();

Client-Side Components/UI Actions/CloseChildCases/README.md

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+Name: Close all Child Case
+Table:sn_customerservice_case
+Condition: (gs.hasRole('sn_customerservice_agent') || gs.hasRole('admin') ) && (new GlideRecord('sn_customerservice_case').addQuery('parent', current.sys_id).query().hasNext())
+
+Use Case: 
+Provide UI action button to close all the associated child cases from the parent Case.