Is it possible to amend the nominal / expense code description in QB - ie want to add numbers to beginning of the current description ?

you mentioned the key word - chart of accounts - could not think of it - only use QB occasionally 

Since you occasionally used your QuickBooks Online account, I’m happy to walk you through the steps on how to add numbers to your Chart of accounts, Peter.

To do that, make sure the account numbers feature is turned on first. This way, you can start assigning numbers to your accounts.

Here’s how:

1. Go to the Gear icon and select Account and settings.
2. Click the Advanced tab.
3. Tap the Pencil icon in the Chart of accounts section.
4. Select Enable account numbers. If you want account numbers to show in reports and transactions, select Show account numbers.
5. Press Save and then Done.
   

After, you can refer to this reference to add numbers: Use account numbers in your chart of accounts in QuickBooks Online. It includes resources on how to properly organize your list.

Moreover, here's an article in case you need tips to customize your accounts in QuickBooks: Manage chart of accounts. This will help and allow you to quickly determine your financial health so you can make better arrangements in the future.

If you need further assistance with assigning account numbers in the program, you can always get back on this thread and add your questions or concerns. I’ll be here anytime to help out. Have a good day!