Is this possible with the Sena 20s?

Let's say there are 4 of us riding together (2 couples) all with Sena 20s's. Each couple would like to be intercom only with the other person but would like to be able to intercom with all four at times, while riding.....can one of the couples, using the Sena mobile app, connect up with the other couple while riding? And, can the opposite couple connect up through the Sena mobile app if they desire to?

In other words....say each couple is able to talk to each other and the other couple can talk to each other without the other couples hearing them but say couple "A" wants to stop for lunch can one of them connect up all four riders when they desire to?

AND, can
couple "B" do the same thing if they desire to?

Thanks for any help....