Check out MadCap Flare: Conditional Text 101 by Ivan Walsh. Here is an excerpt:
Conditional text is one of those writing tactics technical writers love to talk about… but never seem to use.
It’s a shame as conditional tagging can save you a lot of time, especially if you have technical documents which share 90% of the content but the other 10% needs to be tweaked for each…
The full article is available here.