External link

Hello... another question here.

In AM2, I sued to have external field for notices on another site and I used like this:

<td valign="top" width="50%">
<!-- templateIf : $article.externalLink$ eq "" -->
<a href="$published.articlePage.url$" title="$article.title$"><h3>$article.title$</h3></a>
<a href="$published.articlePage.url$" title="$article.PromoTitle$">$article.PromoTitle$</a>
<span id="sumario">$article.summary$ <a href="$published.articlePage.url$" style="color:#04B431;" title="Presione aqui para ingresar ">Presione aqui para ingresar</a></span>
<!-- /templateIf -->
<!-- templateIf : $article.externalLink$ ne "" -->
<a href="$article.externalLink$" title="$article.title$"><h3>$article.title$</h3></a>
<a href="$article.externalLink$" title="$article.PromoTitle$">$article.PromoTitle$</a>
<span id="sumario">$article.summary$ <a href="$article.externalLink$" style="color:#04B431;" title="Presione aqui para ingresar ">Presione aqui para ingresar</a></span>
<!-- /templateIf -->

How can I implement this on CMS Builder?

I think I can insert a text field on the table but, how can I create the IF statement on my code in order to show external link or article link.

Thanks!

Jesus