To update GL Codes, you can follow these steps:

1. Go to the "Membership Billing" menu.
2. Under the "Data Export" section, click the "Edit General Ledger Accounts" link.
3. If the desired GL account/code is not listed, click the "Add New GL Account" link at the bottom of the page.
4. From the "QB Item" drop-down, select the QuickBooks Item you want to assign transactions to.
5. Enter a descriptive name for the item in the "Description" field. It's recommended to use the same name as the QuickBooks Item for consistency, but you can choose a different description if needed.
6. The "Account Number" field is optional but can be used to assign a number to the account.
7. Click the "Submit" button.