Autoblog by category

Hello,
I wondered if it's possible to set up auto-blog so that it only populates the RSS content from the main blog on to another blog if there is a match on the main blog for a particular category? The idea was to have a main blog and then a number of child blogs that would show the same post content if a category value was met.
I searched the forums but could not find.
Thanks,
Cyri