diff --git a/oaisim/templates/_helper.tpl b/oaisim/templates/_helper.tpl
new file mode 100644
index 0000000..a9d3a15
--- /dev/null
+++ b/oaisim/templates/_helper.tpl
@@ -0,0 +1,51 @@
+{{- /*
+# Copyright 2019-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+*/ -}}
+
+{{/*
+Return endpoint of the given application.
+*/}}
+{{- define "oaisim.endpoint_lookup" -}}
+{{- $app := index . 0 -}}
+{{- $type := index . 1 -}}
+{{- $context := index . 2 -}}
+{{- $appContext := index $context.Values.conf $app -}}
+{{- $appName := $appContext.name -}}
+{{- if eq $type "fqdn" -}}
+{{- printf "%s-0.%s.%s.svc.%s" $appName $appName $context.Release.Namespace "cluster.local" -}}
+{{- else if eq $type "short" -}}
+{{- printf "%s-0.%s" $appName $appName -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Render the given template.
+*/}}
+{{- define "oaisim.template" -}}
+{{- $name := index . 0 -}}
+{{- $context := index . 1 -}}
+{{- $last := base $context.Template.Name }}
+{{- $wtf := $context.Template.Name | replace $last $name -}}
+{{ include $wtf $context }}
+{{- end -}}
+
+{{/*
+Return PLMN from MCC and MNC.
+*/}}
+{{- define "oaisim.plmn" -}}
+{{- $mcc := index . 0 -}}
+{{- $mnc := index . 1 -}}
+{{- printf "%s%s" $mcc $mnc -}}
+{{- end -}}