Linking classes to upper directories?

I see a million examples of linking classes and packages that reside in the same directory or subdirectories w/in the the same directory as the
main flash project but I can’t find any examples of linking to classes in upper directories.

For example most linkage properties will look like this:


which would be this: ./be/boulevart/as2/as2_cryptdemo

I want to reference the same class but in an encryption directory in the directory above the current project directory where
multiple projects can access the same class.