The field commands allow you to define additional fields that will become a part of a user's information. An example of a field is the Oper field. This field is set automatically when someone opers and it shows that they are a network operator. But other fields can display personal information such as a user's age, job, interests, or whatever you want to set up for them.
ADD - Add a field name.
DEL - Delete a field name.
LIST - List a field name configuration.
SET - Set additional configurations on field.
Examples:
/as help field <command>
List will show all of the attributes you have set for that field.