Maybe some examples will help... please see comments/ideas in yellow highlight

e.g. 1

Create a 'Master' Portal with a links module - containing 0 to many links - which are syndicated via XML or some other method

On the same DNN install have multiple portals which will subscribe (read and display) the links  from the 'Master' portal. When you click the link on the subscriber portal you will be taken to that link - not the master portal

I currently setup this way but the XML syndication of the links module does not contain the link - instead it contains a link back to the master site

e.g. 2

Imagine similar as above but with pages managed at the master site level which are in turn accessable/displayed on subscriber portals.

The Gist of it is to feed generic content to subscriber portals - the subscriber portal admin/webmaster can choose hide (or not) this but cannot edit this content. Imagine the master portal content that child sites subscribe to would be stored in a direcotry READABLE by all subscribers but editable only from the master portal