When adding and submitting an expense, if you need to be able to state specifically what the VAT is of the purchase, you can enable this in expenses general settings.
Click on your name on the top right, then click Settings.
On the settings menu, click Expenses, then General.
At the bottom select Show "VAT" field for each expense claim.
Click Save.
The next time an expense is added, you will have an option to enter VAT amount.
There will also be VAT column on your expenses.
📎NOTE: The number you put in 'Amount' needs to be established and made clear to your employees. For example, decide whether you want the net amount (total amount - VAT amount) to be entered under 'Amount', then the VAT amount under 'VAT', or whether you want the total amount (Net amount + VAT) entered under 'Amount' then the VAT amount under 'VAT'.