could it be possible to make my smb as a pdc and my win2k as the bdc???

I can be of little help here, but a quick search on google came up with some results that may be of some help.

Try searching with the key words samba pdc bdc windows or some variants of this and you should come up with some useful links.

before googling, you should read up on the documentation provided
by the Samba project ( samba.org ).

It is possible to set up an network where Samba is the PDC but at present this
would require your BDCs also to be running Samba. The reason is the domain database
is maintained by a backend LDAP server, which is not what Windows does.

If you install Cygwin on your Win2k system, you can then install Samba on it, too.

A future version of Samba is expected to provide full Active Directory services.