Welcome, @Cassandra_Simmons,
You should contact Asana Sales to have them help you with this, but I believe what you will want is to ask them to set up a paid Division (at whatever plan level you want) for those users you mention as “Team A,” and leave the rest of the Org as unpaid by default.
See this post about collaboration options among Division and free users, a newish feature that broadens access and collaboration:
@Jan-Rienk, maybe I’m misunderstanding something, but I think this is what Cassandra is after; let me know if you disagree and we can unmark this as the solution if so.
@Julien_RENAUD, I didn’t read through all the posts at your great Divisions topic, but I think your solution post there should be updated with the newish info linked above, right?
Thanks,
Larry