Another possibility is to maintain only one collection, but to create the illusion of two separate collections by having two copies of the contents ('manage_main') page, each modified to display only one kind of child.
Two different views on the same model, like this, is bussiness as usual.
regards Max M
Zope-Dev maillist - [EMAIL PROTECTED]
** No cross posts or HTML encoding! **
(Related lists - http://mail.zope.org/mailman/listinfo/zope-announce