We use the source code mode of the WYSIWYG editor to accomplish this:
Open your previous site with a browser.
In the menu bar, click on View | Source, you will see the HTML markup of the page.
Find and copy that part of the content that you want to migrate to Liferay Portal (some sample HTML mark-up follows):
<h1 class="section-heading"> Announcements & Alerts </h1> <h2> West Coast Symposium - September 2011</h2> <p> Liferay's third annual <a href="http://liferay.com/wcs2011">West Coast Symposium</a> will be held in <strong>Anaheim, California on September 21-22, 2011</strong>. The Symposium is a great opportunity for learning, knowledge sharing, and networking. <a href="http://liferay.com/wcs2011">Registrations are now open</a>!</p>
Go to Control Panel | Web Content | Add Web Content.
In the Name field, enter MIGRATED-CONTENT...