A: Hey Mike, thanks for the questions.
Subaccounts are like separate accounts that share the same contact limit.
You can add different team members to each subaccount, have totally different contact lists in each subaccount, etc.

The total number of contacts across your subaccounts can’t be higher than the contacts on your license. If you have a 10,000-contact license and 4,000 contacts in one of your sub-account, the rest of the sub-accounts can have up to 6,000 contacts.

Adding a quota for subaccounts sounds like a good idea, and we will consider adding it to our roadmap if there is a demand for it.

Let me know if I managed to answer your questions.