Workflow liferay portlet create definition

Hi..

I've not worked with Liferay, but I've read that its default implementation
relies heavily on the capabilities of jBPM: http://content.liferay.com/4.2/doc/user/liferay_4_portal_administration_guide/multipage/ch09s04.html 

jbpm main site: www.jbpm.org

For using jbpm, the userguide is very useful:

http://docs.jboss.com/jbpm/v3.2/userguide/html/index.html

to use a visual tool for creating process definitions, you could download and use jbpm graphical process designer (gpd):

http://docs.jboss.com/jbpm/v3/gpd/index.html

I hope that would help you a bit.

Thanks.