Samba, Group add at creation

I have a Samba directory share that the intent is to have all Users in
the Group be able to read / write all files.
When a User creates a file, the same User is created as the Group, and
not as the Group name.
Hence if Joe creates a new file, the Group = Joe and not sch_office

Directory:
/var/local/samba/School_Office set at 770
User = root read / write / list
Group = sch_office read / write / list

Samba Share:
[School_Office]
write list = @sch_office
path = /var/local/samba-shares/School_Office
force group = sch_office
comment = Type - 5
valid users = @sch_office
create mode = 770
directory mode = 770

Samba Global: (Some lines deleted that are not nessasary to the question)
[global]
map to guest = bad user
encrypt passwords = yes
dns proxy = no
netbios name = server
writeable = yes
server string = Samba
wide links = no
workgroup = OURSAVIOR
os level = 65
security = user

--
Jerry Perkins
Home site http://www.jperkins.us/