I have a group of 3 companies, each with different configurations in their Chart of Accounts.

They occasionally have related transactions.

Rather than pay $12 each for standard organizations, I wanted to pay $36 for Premium to unlock some other integration features like Sign. I assume that I can fully report at branch level, but also at the organization level. 

My question is: If I make them three branches within one organization, can I import in the existing organizations as branches and allow each to maintain a different chart of accounts?