PR Release strategy

Hi,

I want to configure PR release strategy based on a Zfield.

As this is a Zfield which will not be present in CEBAN, Is it possible to insert this Zfield in CEBAN structure?

Please also tell me if there are any user exits available so that I can calculate at PR creation time and push that value to this zfield and the PR release strategy will be based on this zfield.

Thanks and Regards

Pavan