Sub rooms aren't something supported by the HipChat UX, but there have been a few users who have requested similar things before. If it's something you'd find useful, please check out https://jira.atlassian.com/browse/HCPUB-2556 to vote / watch so you can be informed of any updates to it. Feel free to comment on it explaining your use case as well... details like that are super helpful in understanding the underlying need that makes the feature desirable.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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