In some cases, some portal definitions are defined but not used any more. If you want to delete them, you can add some configurations to portal.war/WEB-INF/conf/portal/portal-configuration.xml.

To delete a portal definition or a portal template definition, you need to define a component plug-in as the example below:

<external-component-plugins>
    <target-component>org.exoplatform.portal.config.UserPortalConfigService</target-component>
	<component-plugin>
	  <name>new.portal.config.user.listener</name>
	  <set-method>deleteListenerElements</set-method>
	  <type>org.exoplatform.portal.config.NewPortalConfigListener</type>
	  <description>this listener delete some predefined portal and templates configuration</description>
	  <init-params>
		<object-param>
		  <name>site.templates.location</name>
		  <description>description</description>
		  <object type="org.exoplatform.portal.config.SiteConfigTemplates">
			<field name="portalTemplates">
			  <collection type="java.util.HashSet">
				<value>
				  <string>basic</string>
				</value>
				<value>
				  <string>classic</string>
				</value>
			  </collection>
			</field>
		  </object>
		</object-param>
		<object-param>
		  <name>portal.configuration</name>
		  <description>description</description>
		  <object type="org.exoplatform.portal.config.NewPortalConfig">
			<field  name="predefinedOwner">
			  <collection type="java.util.HashSet">
				<value><string>classic</string></value>
			  </collection>
			</field>
			<field name="ownerType"><string>portal</string></field>
		  </object>
		</object-param>
	  </init-params>
	</component-plugin>
</external-component-plugins>