Thanks.
I have taken a look at the docs for groupings and groups. (https://docs.moodle.org/28/en/Groupings, and https://docs.moodle.org/28/en/Groupings_FAQ).
The issue is that sections are defined externally by the University and we are setting up Moodle to simply use those.
My understanding is that groupings are collections of groups.
The question is that if I ask our admin to instead generate groupings from externally provided section data, can I then decompose each grouping into multiple groups? This is the opposite of how groupings are seemingly defined.
I am looking to make manual subgroups of groups, not combine groups into larger groupings.