Hi there, @kingcohandymanse.

Before anything else, we want to ensure we're giving you the correct information. Are you trying to reconnect your bank account and its subaccount? Or import bank transactions using CSV files inside QuickBooks Online (QBO)? This way, we can provide the necessary steps to help you resolve this situation.

Don't hesitate to comment below or visit the Community space so we can respond as soon as possible. Keep safe and have a good one.