SIRMick,
1. Can I change the photo for the sub group?
Yes. Same as the primary group.
Visit the subgroup's Settings page, click on the Cover Photo tab.
2. Can I have different setting as regards membership to the main
group
Yes, the subgroup's settings are (nearly) independent of the primary group's settings.
Moreover, each subgroup member can have different subscription settings in each subgroup and the primary group.
Shal
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