Applying password policy automatically on every user

After spending so many hours trying to find a better method to apply a password policy, there is my case.

We are trying to setting up a password policy (never configured before) on a subtree under RH directory server.

Once the policy has been configured, after the user change its password, the necessary fields are created automatically.

Do you know if there is any procedure to apply policies automatically on every register on OU, without forcing users to change its password manually?

Thanks in advance.

Best Regards.