I was literally pulling my hair over a simple VSS 2005 issue: how to branch/share a project?

The official documentation is too poor, does not even remotely come close to explaining the wierd error I was getting:

"A project cannot be shared under a descendant".

Only after googling I got hold of a nice blog entry which fixed the issue:

http://blogs.vertigosoftware.com/ericc/archive/2005/12/05/1716.aspx

I hope this helps others too...btw I have decided to switch to Surround SCM !