Thanks for getting back to us, @usertatiana-koumidou. 

I can see your concern about not wanting to assign a 0% tax rate, which would still include the transactions as taxable in your VAT return. I'm here to help you out.

We can select the No VAT option in the Amounts dropdown, you are effectively marking these invoice line items as "Out of Scope" for VAT purposes. This will exclude them from your VAT calculations and reporting, without inadvertently applying a 0% VAT rate.

Here are the steps to select the No VAT option on the Amounts dropdown for the invoice:

1. Open the relevant invoice in QuickBooks.
2. Locate the Amounts are dropdown
3. Instead of leaving this set to the default option (likely Inclusive of VAT or Exclusive of VAT), select the "No VAT" option from the dropdown.
4. This will ensure that no VAT is calculated or applied to the line items on this invoice.

See the screenshot below for your reference. 

For more insights on how VAT codes work in the system, please see this link: How do I set up sales GST/VAT rates and use them on forms? (International QBO).

Lastly, I'd like to share this reference with you to guide you in utilizing QuickBooks together with its great features: Get started with QuickBooks Online.

I'm just a reply away to assist you if you have any other questions. Take care!