I don't think you have too many email templates to copy them automatically. If you still need to do that, you have to write your code to get content from old model then append it to new one. But if there are only some email template, do it manually will be faster.
I've managed to create custom email template and hide the existing default email template. I'm looking for a solution to copy the values from existing email template to new email template. so user don't need to enter the email details manually.
Custom email template is added to send file upload as attachment to emails. Much appreciated if some one could help me at the earliest on this please