Greetings, @office-xtremesou.
Welcome to the Community! I'd be more than happy to provide you with an answer to your question about parent and subaccounts when connecting them to online banking.
If the transactions download to one account, connect only the parent account. If the transactions download to the individual accounts, connect the subaccounts and not the parent account.
Note: You can’t connect both a parent account and its subaccounts. If you try to connect both, you’ll get a message that the account is already connected.
For additional details to help you in the future, check out this guide: About bank or credit card subaccount setup.
I hope this helps. If you have any trouble along the way, don't hesitate to come back. Take care!