Okay. I successfully did it. It appears that the important thing is that the ln -s be an absolute path so:
a. create a subsite 'foo' using the admin interface
b. login to the server and mkdir /var/lib/aolserver/service0/www/foo
cd /var/lib/aolserver/service0/www/foo
ln -s /var/lib/aolserver/service0/packages/edit-this-page/www/index.vuh .
I'm assuming that is what Joel meant to say since acs-subsite does not have an index.vuh
