changes to a company credit card with multiple cards

Hello, EJ.

I'll show you the correct process in handling and merging the connected bank account you don't need anymore. 

The correct and simple way is to disconnect the card that is being removed. Then, merge it to your current active card. 

First, disconnect the account from the Online Banking feature: 

1. Go to your Chart of Accounts.
2. Find the account you don't need, then click the arrow icon beside View register.
3. Select Edit.
4. Check Disconnect this account on save.
5. Click Save and close. 

Disconnecting the account removes all of the transactions under the For review section. I would recommend categorizing or adding those pending transactions first before doing this. 

Then, merge the account with the other card: 

1. Copy the name of the account you want to keep. 
2. Open the other account, then click the arrow icon beside View register.
3. Select Edit.
4. Paste the name of the active account in the Name field.
5. Click Save and close.
6. Confirm the prompts to proceed with the merge. 

Also, both accounts must have the same Detail and Account types. I take it that they are both set up as Bank for Account Type. For the Detail Type, edit it as you merge the account. 

Do you need a reference for the merging process? I'm sure you'll find this article helpful: Merge duplicate accounts, customers, and vendors in QuickBooks Online.

If you need help with the reconciliation process, we have an article to guide you with the process: Reconcile an account in QuickBooks Online.

Looking for more details about managing your accounts in QuickBooks Online? Reply to this thread and I'll help you out. I can also answer any other questions you might have.