开云体育

With some help from ChatGPT, it appears that my first group will remain as-is and become the parent of all subgroups. ?

Correct, the "main" group (which created the original group) will always remain as is, aka the "master" group, or parent of all subgroups if any of those are created.? BTW after creating the fist subgroup, that main group's name is defaulted to "main" but it can be renamed to something else than that, depending on how you want to setup the whole thing.

So I'm planning to a church-wide parent group and create its first subgroup for the AV Team.

Is that starting on the right foot?

Yes, main group can be the "list" of all members, and each member can then choose what subgroup to belong to. You'd need to decide though how to setup the main group in terms of the default subscription, whether it'd be an announcement group only or allow discussion, etc, etc.

If you're not familiar with it, I'd refer more to the groups.io manuals instead of ChatGPT.

Cheers,
Christos