[support] Permissions Question

[antgiant]

I have what I think must be a common permissions question, but I can't seem
to find the answer.  I want to set my Drupal site up in a tree structure.  I
want to grant create/edit/delete permissions by selecting one or more nodes
in the tree and granting a role the ability to edit those nodes as well as
any child nodes.  A simplified example would be a site with two primary
sections and each primary section has two subsections.  I want to be able to
give rights to the primary section, which would include rights to the
relevant subsection.  However, I also want to be able to grant rights just
to a particular subsection.  How can I do this?
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