All portal properties in Liferay Portal 6.2 that are also used in Liferay Portal CE 7.0 can be overridden. Portal property and portal event action hooks that use these properties can be upgraded to Liferay Portal CE 7.0 by following these steps:
Adapt your code to Liferay Portal CE 7.0’s API using Liferay IDE’s Code Upgrade Tool.
Deploy your hook plugin.
Liferay Portal’s Plugin Compatibility Layer converts the plugin WAR to a Web Application Bundle (WAB) and installs it to Liferay’s OSGi Runtime.
Your custom property values and actions are live.