Create rule to copy newly added member to another group

We have a need to listen to groups in a specific folder, and when a member is added to one of those groups, add it to another target group (possibly outside that stem). There won't be a rule for deleting members, so the effect is to create an accumulation of anyone ever added to the folder.

This is the opposite of the capability that is in the flattenedMembershipAddInFolder rule. For that rule, the Then action acts on the group that triggered it (to send an email, etc). There isn't a Then rule to add that member to another group (is there?).