is it possible to merge bank accounts that are duplicate ?

Depending on the account you're trying to merge, you can do it on the Chart of accounts (COA) page by selecting the specified account, dlangley.

To begin, please note that merging accounts is permanent and cannot be undone once completed. Also, some accounts created by QuickBooks, especially those connected to online banking, are not recommended for merging.

When you're ready, ensure that your bank account isn't connected to QuickBooks. Otherwise, you won't be able to merge the account you have in your COA. After disconnecting the account, these are the steps to help you merge accounts:

1. Click the Gear icon in the top-right corner and select Chart of accounts.
2. Choose the account you want to keep, click the dropdown in the Action column, and select Edit.
3. Note the Account Name, Account Type, and Detail Type.
4. Check if the account is a subaccount or a parent account. The names of subaccounts are indented in the Name column of the Chart of accounts list. If it is, note the parent account it's tied to.
5. Go back to the Chart of accounts.
6. Find the duplicate account (the one you won't keep). Then, select the dropdown in the Action column and then Edit.
7. Change the Account name and Detail Type to that of the account you want to keep.
8. When you're ready, select Save and then Yes, merge accounts. QuickBooks moves past transactions from the duplicate to the account you want to keep.

For visual reference, please see the image below.

You can also visit this page for more insights about the process: Merge duplicate accounts.

Feel free to go back to this thread if you have more questions.