ive beaten vens story and started terras so i was wondering where do i save ovber the file ive saved vens or on a new file

New one! Definitely a new one! lol you don't wanna overwrite with a different story.

thanks

Like Terranort said, just save on a new file. There are multiple ones, so you can save one for each of the characters (:

ive beaten vens story and started terras so i was wondering where do i save ovber the file ive saved vens or on a new file

 

Make a new one because after you beat the last episode you can load any other file and fight vanitas's spirit