New Post: What about multiple tabs for produtc description?

You are working fine. It's a demo template to understand extra field usage.
To add a simple multi tab try to use the next code (it's only an example!)
productxmldata.template

RichText : [<tag id="Tab1" type="dnntexteditor" height="400" width="600" />]
RichText : [<tag id="Tab2" type="dnntexteditor" height="400" width="600" />]
RichText : [<tag id="Tab3" type="dnntexteditor" height="400" width="600" />]

productdetail.template

<link href="http://blogs.sitepointstatic.com/examples/tech/css3-target/tabs.css" media="all" type="text/css" rel="stylesheet">
    <article class="tabs">
        <!-- tab 1 -->
        <section id="tab1">
        <h2><a href="#tab1">Tab 1</a></h2>
        [TAG:XMLDATA:genxml/edt/Tab1]
        </section>
        <!-- tab 2 -->
        <section id="tab2">
        <h2><a href="#tab2">Tab 2</a></h2>
        [TAG:XMLDATA:genxml/edt/Tab2]
        </section>
        <!-- tab 3 -->
        <section id="tab3">
        <h2><a href="#tab3">Tab 3</a></h2>
        [TAG:XMLDATA:genxml/edt/Tab3]
        </section>
    </article>