No - you can't "unlearn" something. BUT you CAN train yourself to do something different....You would have to retrain yourself to wet the bed, or your pants, or diapers - but retraining is the key, not "untraining". But if you really want this, and that truly is your goal, then good luck....It's not going to be easy. for more help go to http://www.deeker.com/Articles/twelve_month_diaper_training_program.pdf
To add another bit of information, you can weaken your bladder muscles by stopping the flow of urine while midstream. I would suggest forming a regular routine of doing this each time you must 'go' and keeping it 'stopped' for a few seconds, at least.
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When moving from beloved potty to toilet, some people use a potty seat cover. This is an additional item that sits on the toilet, and is less daunting then the real toilet. Once a child grows they may stop using the training seat and move on to just sit normally on the big seat. It works. Usually Target sells items like this.