Deb,
Is there a way that one subgroup can send a message to another
subgroup"
Since all subgroup members are perforce members of the primary group, in the target subgroup's Settings page, on the Messages Policies panel, you can check the "Allow Parent Members to Post" box.
That won't restrict messages based on the subgroup(s) of the sending member, but may do what you need.
Shal
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