Changing character feats

[Tahlilian]

Is there rules for changing feats.

I've been searching and have come up with nothing.

Has anyone ever bought new source material and wanted to change their feats to accommodate for a new prestige class or any other reason, do you guys not allow any changes.

Is there any cool house rules anyone has or have done before.

 

[Dandu]

PHB2 retraining rules.

 

[Tahlilian]

Thanks Dandu