The staff code found on the Fund 1 tab is typically used in medium to large foundations to indicate which staff member is in charge of maintaining a relationship with the founders and fund representatives of the fund. They are the individual that knows the most about the origin and management of the fund and any special requirements they might have. It is not necessary to have the staff field filled in.
If you choose to use the field, not all funds need to have a value. You might choose to code only those funds that need special attention.
Note that the code table for this field is the same table used for the other staff values in the Gift Module and is the same table as the program officer code in the Grants Module. To add or modify the values in the table go to File Maintenance > Profiles > Profile Code Maintenance > Staff.