Is there a way to personalise expense categories to suit our business better and to avoid large amounts of money showing in uncategorised expenditure?

Thank you for posting in the Community,@info606.

Yes, there's a way to personalise your expense categories in QuickBooks Online. Your Chart of Accounts suits better for your business and help you organize your uncategorized expenditure. Let me guide you how:

1. Click Accounting on the left panel.
2. Click the New button at the top right.
3. Select the Category Type (Expenses or Other Expenses).
4. Select the Detail Type (see the description below to help you select the right type).
5. Enter the Name.
6. Description is optional.
7. Click Save and Close.

For the detailed process please check this article: Create a new account in your chart of accounts in QuickBooks Online.

Also, I'll suggest contacting your accountant for further guidance on what account type you will use in setting up your custom category for your expenses.

Also, I provide these helpful articles for future reference:

• Understand QuickBooks Chart of Accounts.
• Organise your accounts into parent accounts and subaccounts.

That should do it. I'm just a post away if you have other questions on how personalise your Chart of Accounts. I'm always here to help.