You can indicate in a supplier file if the VAT for this supplier is non-deductible. This puts the VAT field to 0. The VAT will be added to the price excluding VAT because you can usually put this as an professional expense. If you want more info about non-deductable VAT and the percentage of professional costs we advise you to contact your accountant.
If you want to enable this option for a supplier, open their file via the menu 'Suppliers'. Next, check the box next tot 'VAT non-deductable'. Don't forget to click save at the bottom.