using svn:externals with svn propset

if you can’t use svn propedit (ie. your using bespin) you can use svn propset

svn propset svn:externals 'Zend http://framework.zend.com/svn/framework/standard/tags/release-1.10.0/library/Zend/' library

the above make the folder Zend within the folder library reference the zend svn repo

note: refer this post for info on svn:externals with svn propedit http://blog.justin.kelly.org.au/svnexternals