I am having the same problem and i am surprised no statistician here can help.
Did you finally find a solution to the problem?
I'm skeptical that you have the "same" very specific problem that was described in this message; you may have a similar problem, but it would help if you described your problem in detail, starting from the beginning.
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.