[Samba] how to setup file sharing access rights

[dont know]

Hi,
   
  I am new to LINUX and SAMBA, so please help me.  We have a file share server set up in our office .  Therefore everyone in the office can access the Projects directory  on the LINUX server /home/project/ from their Window PCs. The projects section of the smb.conf file looks like this 
   
  #############
  [projects]
   comment = projects
   path = /home/project/
   browsable = yes
   writable = yes
   valid users = root, user1, user2, user3.............. user10
   force user = samba
   force group = samba
   guest ok = no
   
  ##############
   
  Now there is a drawings folder under the projects directory
  /home/project/project1/drawings 
  and we want to let only user1 and user2 to be able to read, write and modify files in the drawings folder.  And we want that other users should only be able to read the contents of the drawings folder.
   
  I would really appreciate if you can help me to set this up.
  Thanks for your time and help.
  yes
   
   

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