Default UserProfile Model MVC4

Hi Guys
Im just wondering about the default Account Model thats given in the MVC4 template, they have multiple models in the Account model ie UserProfile, LoginModel, RegisterModel, LocalPassword etc, can i combine the UserProfile and LocalPassword model or is there a reason they were seperated? What i am trying to achieve is a create user form with password fields rather than the standard register user model thats given.

Cheers!