vtml

  <?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
    <!--
      In the default configuration of the global file, the values for a configuration in the global file supersede the values
      in the project configuration. This behavior can be changed by specifying a condition on the property as follows:

  		<SitecoreWebUrl Condition=" '$(SitecoreWebUrl)' == '' "></SitecoreWebUrl>

      By adding the above condition, the value specified in the global configuration file will only be applied if the

vtml

<rewriteMaps>
 <rewriteMap name="CustomCultures">
 <add key="jp" value="jm" />
 </rewriteMap>
</rewriteMaps>

vtml

<rule name="RewriteCustomCultures" enabled="true">
 <match url="^(/?)en-(jp)(/?)(.*)?" />
 <action type="Rewrite" url="en-{CustomCultures:{R:2}}/{R:4}" appendQueryString="true" />
 </rule>