Here is a really cool feature of OpsMgr: the ability to create groups easily based on any discovered attribute of an object.
OU is something that is part of the Windows Computer object discovery. If you examine a state view – you will see in the details pane discovered information… and OU is there. Typically this means we can likely use that object (Windows Computer) and OU will be a discovered attribute of that.
This also means is we personalize a Windows Computer based state view – we can add OU: 
To use a grouping, create a group, add Windows Computer object, and then a rule based on OU:
A right click – view group members reveals:
Great article Kevin! This is a good candidate for a fragment, which could be extended by adding a membership rule for the respective health service watchers.
can we discover from child ou with this rule?
Hi Kevin,
if I do groups the way you explain here via OU and I create an Alert view for for that group, will they still get Heartbeat alerts in their views as well?