String xml = "";
FormTemplate template = this.Template;
using (Stream s = template.OpenFileFromPackage("template.xml"))
{
    XPathDocument reader = new XPathDocument(s);
    XPathNavigator nav = reader.CreateNavigator();
    XPathNavigator repeat = nav.SelectSingleNode("/my:myFields/my:Repeats/my:Repeat[1]", this.NamespaceManager);
    if (repeat == null)
    {
        return;
    }
    xml = tender.OuterXml;
}
if (!String.IsNullOrEmpty(xml))
{
    XPathNavigator destination = this.CreateNavigator().SelectSingleNode("/my:myFields/my:Repeats", this.NamespaceManager);
    destination.AppendChild(xml);
}

The top part of the code is particularly useful if you want to use the Default Values for repeating sections in InfoPath.  Your code will read the xml for the default values and insert them into the repeating section.  I've previously hardcoded these XML segments for insert, but that's extremely error prone when you inevitably update your XML template with new and more exciting child elements and attributes.