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Hi Claudio, 

Without having the theme (or being able to see it if it is on a live site) it's difficult to advise. What I can do is tell you how it SHOULD be done, but that might not be the way it has been implemented on your side.

Liferay use the onion layers approach. A page is not a html page with everything embedded in it, it is actually the result of multiple layers that come together that when assembled make up the page.

Each "page" you add can be conceptualized like this. The biggest outer box (or layer) is the Theme such that it is applied (or available anyway) to all the inner layers of the onion. Next you have the layout which designates the areas of the page where you can add items. Inside each of the sections you drop portlets -- which are like micro-applications that have been built to perform, normally, something specific. 

Now, in your case, you have a new "Page" called About Us. On that page you assign a Layout -- lets set a 2-column layout with 75% widh on the left and 25% on the right. Inside the left side container of your layout you would want to render the text for the About Us. To do this (properly) you would add the Web Content Display portlet to that section and then configure the portlet to render a piece of structured content that you would either create on the fly when you are configuring the portlet, or that you have created in advance in the Control Panel > [your site] > Content > Web Content section. 

.. now, if you have followed this approach, then you should be able to export all of this stuff and then import it into your new environment. Even better, if you get lucky and you upgrade works flawlessly, it'll "just be there" and all you have to do is make sure it still renders correctly.