[Zope] newbie question: level of security

[fatih oguz]

hi,

i guess such a question is asked before but i could not find anything in 
mailing list archives ( may be i used improper keywords).

i would like to assign new users ( their roles are project1, project2) who have 
access to only those project1 and project2 folders. those project folders are 
located under one of members' folder.

i guess it should be done thru defining local roles . but i could not do 
anything.

can i have some advices...

thanks in advance

fatih