AlterBrains

I've been browsing for answers, and the usual answer for having articles from the master site show up in the slave site is to create a category for the slave site.

But I now wondering if I can install a multi category extension (such as "K2", or "CW Multicategories").

The idea being some articles I want in both sites (without duplicating the articles) and some I just want in the main site or just in the slave(s) sites.

Can you see any problems with this idea?

It's possible to share K2 database data.

Actually you can also use Joomla tags and display articles not by category by a tag - each site can just have own tag and you will use 'Tags -> Tagged Items' menu item instead of 'Articles -> Category Blog'.

But note that displaying same article in multiple domains is considered by Google as duplicate content.