Edit C:\Windows\PolicyDefinitions\NetworkIsolation.admx

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<policyDefinitions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" revision="1.0" schemaVersion="1.0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
  <policyNamespaces>
    <target prefix="networkisolation" namespace="Microsoft.Policies.NetworkIsolation" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
    <using prefix="windowsfirewall" namespace="Microsoft.Policies.WindowsFirewall" />
	  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="WF_Isolation" displayName="$(string.WF_Isolation)">
      <parentCategory ref="windows:Network" />
    </category>  
  </categories>
  <policies>

<policy name="WF_NetIsolation_PrivateSubnet" class="Machine" displayName="$(string.WF_NetIsolation_PrivateSubnet)" explainText="$(string.WF_NetIsolation_PrivateSubnet_Help)" presentation="$(presentation.WF_NetIsolation_PrivateSubnet)" key="SOFTWARE\Policies\Microsoft\Windows\NetworkIsolation" >
      <parentCategory ref="WF_Isolation" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
	<elements>
             <text id="WF_NetIsolation_PrivateSubnetBox" valueName="DomainSubnets" required="true" /> 
	</elements> 
    </policy>
    
	 
	 
	
	<policy name="WF_NetIsolation_Authoritative_Proxies" class="Machine" displayName="$(string.WF_NetIsolation_Authoritative_Proxy)" explainText="$(string.WF_NetIsolation_Authoritative_Proxy_Help)" presentation="$(presentation.WF_NetIsolation_Authoritative_Proxies)" key="SOFTWARE\Policies\Microsoft\Windows\NetworkIsolation"  valueName="DProxiesAuthoritive" >      <parentCategory ref="WF_Isolation" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
	
 		<enabledValue>
    	  	  <decimal value="1" />
    		</enabledValue>
    		<disabledValue>
     		   <decimal value="0" />
    		</disabledValue>

</policy>
	 
	
		<policy name="WF_NetIsolation_Authoritative_Subnet" class="Machine" displayName="$(string.WF_NetIsolation_Authoritative_Subnet)" explainText="$(string.WF_NetIsolation_Authoritative_Subnet_Help)" presentation="$(presentation.WF_NetIsolation_Authoritative_Subnets)" key="SOFTWARE\Policies\Microsoft\Windows\NetworkIsolation"  valueName="DSubnetsAuthoritive" >      <parentCategory ref="WF_Isolation" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
	
 		<enabledValue>
    	  	  <decimal value="1" />
    		</enabledValue>
    		<disabledValue>
     		   <decimal value="0" />
    		</disabledValue>

</policy>
	
  </policies>
</policyDefinitions>

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