GL CODES

Welcome to the Community, @Fawaz040.

Let me ensure you can add General Ledger (GL) codes to your accounts in the Chart of Accounts (COA). This way, you accurately record all your financial transactions in QuickBooks Desktop (QBDT).

Beforehand, you'll want to ensure that you have set your account preference and enabled the account number feature. Here's how:

1. Click the Edit button, then select Preferences.
2. Go to the Accounting tab.
3. Select the Company Preferences tab.
4. Check the Use account number box.
5. Click OK.

Once done, let's utilize the Verify and Rebuild data utilities. That way, we can verify and correct your company file's most typical data errors. Please make sure your QuickBooks Desktop is up to date as well.

Here's how:

1. Go to Window, then Close All.
2. From the File menu, click Utilities.
3. Select Rebuild Data.
4. Follow the on-screen instructions to back up your data.
5. When the tool finishes, select OK.
6. Go to the File menu, then click Utilities.
7. Click Verify Data, then choose Rebuild Now once QuickBooks finds an issue with your company file.

I'm adding this article for reference: Verify and Rebuild Data in QuickBooks Desktop. On the other hand, you can also edit the account to enter the GL codes into it. I'll be grateful to lay out the steps for you:

1. Go to the List menu, then select Chart of Accounts.
2. Find the account you want to add an account number to, then right-click on it.
3. Select Edit Account.
4. Add the account number in the Number field.
5. Click OK. 

Additionally, here are some resources to help you manage your chart of accounts: Learn about the chart of accounts in QuickBooks.

You can also read this article if you use QuickBooks' Online Bank Feeds and need assistance handling your bank transactions: Add and match Bank Feed transactions in QuickBooks Desktop.

Please let me know if you need more help with managing your COA. I'm always available to help. Have a good one!

It sounds like you mean account numbers.

To assign account numbers, edit each account without a number and add the number in the account "Number" field:

I got it!

But I have a huge list. I thought GL Code is auto generated. Only for few items Codes generated.

When creating a company and using one of the standard chart of accounts, most (all?) of those accounts do have numbers.  However, when creating accounts manually, no number is supplied.