In the Portlet Preferences Editor set URL Configuration to Wizard-generated configuration.
Access the wizard preference.
Click Restart to enter a new URL.
Enter the starting URL, then click Continue.
Navigate until you have reached the desired page, then click Continue.
If you are done, you can skip to the Save step, otherwise click Divide-Page.
You may change the Start and End Tags and click Restart-Divide if you wish to divide by another tag.
You may click Divide-Lower until the desired divisions have been sectioned off.
Select the check boxes next to the desired sections and click Finish-Divide.
Click Save. Be sure to Return to List View and click Save Preferences.