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 a professional expense. If you want more info about non-deductible 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 to 'VAT non-deductable'. Don't forget to click save at the bottom.