gistfile1.txt

spec:
  template:
    spec:
      containers:
        - name: my-container
          image: my-image
          env:
            - name: VARIABLE1
              valueFrom:
                configMapKeyRef:
                  name: my-configmap
                  key: variable1
            - name: VARIABLE2
              valueFrom:
                configMapKeyRef:
                  name: my-configmap
                  key: variable2
            - name: VARIABLE3
              value: $(VARIABLE2).$(VARIABLE1 | cut -d '.' -f 1)
          # Rest of your deployment configuration

Define a ConfigMap YAML file

apiVersion: v1
kind: ConfigMap
metadata:
name: my-configmap
data:
variable1: dzv4019256.iad.icprod.orcindustry.com
variable2: www.xxxxx.com