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To answer your first question, yes the subgroup discussions are searchable. If you type a phrase into the search bar at the top of the page, you'll get results that include text from both general forum and groups.
To answer your second question, there is no "official guideline" for what goes into a group vs. the main forum. It's up to the discretion of the original poster. Similarly, there are no discussions that are restricted to groups.
Would it be possible to treat the subgroup fora as categories under the main forum, such that they'd appear on the main page?
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