How do you configure Samba2.2.8a for multiple authentication?

[Ong, Glen]

How do you configure Samba2.2.8a multiple authentication?
I need to configure authentication to first check the PDC then check the smbpasswd file.
Can this be done? 

Present smb.conf
# Global parameters
[global]
        workgroup = GROUP1
        netbios name = P3
        security = DOMAIN
        encrypt passwords = Yes
        password server = PDC02, PDC03
        log file = /usr/local/samba/log/log.%m
        #log file = /usr/local/samba/log/log.%m.%U
        max log size = 50
        local master = No
        dns proxy = No


 <<Ong, Glen.vcf>> 
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