Intelligent Advisor

Is it possible to use a form of time traveling using Oracle Policy Automation?

e.g.:
In 2006 we developed a rulebase for a company. We made backups of these rules.
In 2007 we used the 2006 as a basedocument for developing rules, a lot of the same variables are used but a lot of things in the calculation and rules are changed.
In 2008 a lot more is changed in the same way.

Is it possible to work with a variable 'ruleyear' and use a specific set of rules?

Gr.