I want sales invoice to show "Amount without VAT" then "VAT amount" and then "Total amount" for each line of sales transaction.

Alternatively, to clearly show the amount without VAT for each item, you can set the invoice to be exclusive of tax. This will display the net price in the Amount column for each line item. 

You could also create a separate invoice for each product if you have multiple line items. This way, the amounts and total for each item are clearly shown on their respective documents.
 
For additional customization options, refer to this helpful article: Customise invoices, estimates, and sales receipts in QuickBooks Online.
 

You’re welcome to reach out anytime if you have further questions or concerns. We’re always here to help.