<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <appSettings>
    <add xdt:Transform="Remove" xdt:Locator="Match(key)" key="foo" />
    <add xdt:Transform="Remove" xdt:Locator="Match(key)"  key="Environment" />
  </appSettings>

  <connectionStrings  xdt:Transform="Replace">
    <add xdt:Transform="Remove"   name="myConnstring"  xdt:Locator="Match(name)" />
  </connectionStrings>

  <system.web>
    <authentication mode="Forms"  xdt:Transform="Replace">
      <forms name="Auth" loginUrl="~/login.aspx" defaultUrl="~/default.aspx" requireSSL="false">
        <credentials passwordFormat="Clear">
          <user name="prod" password="prod"/>
        </credentials>
      </forms>
    </authentication>
    <authorization  xdt:Transform="Replace">
      <deny users="?" />
    </authorization>
    <customErrors mode="Off"  xdt:Transform="Replace" />
  </system.web>
</configuration>