Well If u dont wanna go for code customization n all.. And if ur purpose is to just run alfresco in Liferay portal Simply, Open Iframe portlet in Liferay from Add Application.
U need to have alfresco installed in ur system…and if u use tomcat then u hav to change the port alfresco will use…Otherwise 8080 common port will conflict for liferay n alfresco. Change Alfresco Tomcat port-8081 and keep 8080 for liferay Start server for both-liferay n tomcat Then in IFrame portlet configuration-give url - http://localhost:8081/alfresco
U will see alfresco running in iframe portlet in Liferay