k8s-owner-refs.md

# parent.yaml
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: some-parent
  namespace: default
data: {}

# children.yaml
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: some-child-1
  namespace: default
  ownerReferences:
  - apiVersion: v1
    kind: ConfigMap
    name: some-parent
    uid: PARENT_UID
data: {}
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: some-child-2
  namespace: default
  ownerReferences:
  - apiVersion: v1
    kind: ConfigMap
    name: some-parent
    uid: PARENT_UID
data: {}

kubectl apply -f parent.yaml
parentUID=$(kubectl get configmap/some-parent -o jsonpath='{.metadata.uid}')
kubectl apply -f <(sed "s/PARENT_UID/$parentUID/" children.yaml)
kubectl get configmaps
kubectl delete configmap some-parent
kubectl get configmaps