We tried to make OpenKM as intuitive as possible, but an advice is always welcome.
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I uploaded a document in a folder with name as "C" which is under folder "B", now i want to share the document which is in "C" folder to a user who is not having rights to view the folder "B"?
Can do it with openkm alias ( link ) feature. But it's not present in community version. Really it's only present in our actual development trunk what will not be available for almost users until next year.
For this kind of questions, use our contact form at http://www.openkm.com/en/contact.html. Anyway take in mind alias feature although at the present is yet running in our development environments, until next year we will not start releasing with version 6.5 or 7.0 ( I do not know which will be the version name ).