Q. How can I hide field apart from field level security and page layouts?
(For the above both questions)
A. Using Permission Sets, We can increase the permissions to the user without creating new profile for a single user. Profiles also contain all the options which are in Permission Sets.
Important Points:* To override the profile permissions, we use permission sets.
Creating Permission Sets - Screen Shots (Step by Step)* Find Permission Sets option here.
* Click 'New' here to create new permission set
Assigning Permission Sets - Screen Shots (Step by Step)* Click on 'Users' at 'Manage Users'.