Hello netopscom01,

Connecting both parent and sub-accounts isn't possible.

Since your credit card account download transactions to your parent or main account, connect only to the parent account. Then, manually add the transactions of your sub-accounts in QuickBooks.

I'm attaching an article in case you want to read the details. Here's the link: About bank or credit card subaccount setup.

When you're ready to reconcile, you can check this article for the step-by-step guide: Reconcile an account in QuickBooks Online.

I'll be around if you have questions. Have a wonderful week ahead.