Need opinion on how to manage memberships

I wanted to get some advice about how to tackle a specific setup. This is my scenario:

I have a client that needs to have 1 account for an organization that pays annually through the membership plugin. That would be the "master admin" account.

From there, there would need to be an ability to add new users that fall within that organization, and charge the "master admin" account an amount depending on how many users they have assigned to the group.

Is this possible with the plugin? Any workarounds you can advice on? Thanks!