Edit C:\Windows\PolicyDefinitions\wwansvc.admx

<?xml version="1.0" encoding="utf-8"?>

<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="wwansvc" namespace="Microsoft.Policies.WwanSvc" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="WwanSvc_Category" displayName="$(string.WwanSvc_Category)">
      <parentCategory ref="windows:Network" />
    </category>    
    <category name="NetworkCost_Category" displayName="$(string.NetworkCost_Category)">
      <parentCategory ref="WwanSvc_Category" />
    </category>
  </categories>
  <policies>
    <policy name="SetCost3G" class="Machine" displayName="$(string.SetCost3G)" explainText="$(string.SetCost3G_Help)" presentation="$(presentation.SetCost3G_Presentation)" key="Software\Policies\Microsoft\Windows\WwanSvc\NetCost">
      <parentCategory ref="NetworkCost_Category" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <elements>
        <enum id="Cost3G_Dropdownlist" valueName="Cost3G" required="true">
          <item displayName="$(string.Cost_DropDownList_Unrestricted)">
            <value>
              <decimal value="1" />
            </value>
          </item>
          <item displayName="$(string.Cost_DropDownList_Fixed)">
            <value>
              <decimal value="2" />
            </value>
          </item>
          <item displayName="$(string.Cost_DropDownList_Variable)">
            <value>
              <decimal value="3" />
            </value>
          </item>
        </enum>
      </elements>      
    </policy>
    <policy name="SetCost4G" class="Machine" displayName="$(string.SetCost4G)" explainText="$(string.SetCost4G_Help)" presentation="$(presentation.SetCost4G_Presentation)" key="Software\Policies\Microsoft\Windows\WwanSvc\NetCost">
      <parentCategory ref="NetworkCost_Category" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <elements>
        <enum id="Cost4G_Dropdownlist" valueName="Cost4G" required="true">
          <item displayName="$(string.Cost_DropDownList_Unrestricted)">
            <value>
              <decimal value="1" />
            </value>
          </item>
          <item displayName="$(string.Cost_DropDownList_Fixed)">
            <value>
              <decimal value="2" />
            </value>
          </item>
          <item displayName="$(string.Cost_DropDownList_Variable)">
            <value>
              <decimal value="3" />
            </value>
          </item>
        </enum>
      </elements>      
    </policy>
  </policies>
</policyDefinitions>

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