c# xml import file

I'm trying to find an easy way of merging two XML files rather than re-writing the second file, one is a template and the other contains data, here is a simplified version of the xml

template.xml

<?xml version="1.0"?>
<import>
  <doctype>blah</doctype>
  <style_sheet>blah</style_sheet>
<imported_data></imported_data>
</import>

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data.xml

<data>
 <products>
  <product>
		<code>abc</code>
		<qty>1</qty>
  </product>
  <product>
		<code>abc</code>
		<qty>1</qty>
  </product>
 </products>
</data>

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desired output

<import>
  <doctype>blah</doctype>
  <style_sheet>blah</style_sheet>
     <imported_data>
	<data>
	 <products>
	  <product>
			<code>abc</code>
			<qty>1</qty>
	  </product>
	  <product>
			<code>abc</code>
			<qty>1</qty>
	  </product>
	 </products>
	</data>
 </imported_data>
</import>

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I have it sort of working using this but the data file is not inside 'imported_data'  it gets placed after it and before </import>

XmlDocument xmlTemplate = new XmlDocument();
                XmlDocument xmlData = new XmlDocument();

                xmlTemplate.Load(sHeaderFile);
                xmlData.Load(sDataFile);


                XmlNode node = xmlTemplate.ImportNode(xmlData.DocumentElement, true);
                xmlTemplate.DocumentElement.AppendChild(node);

                xmlTemplate.Save("C:\\temp\\output.xml");

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