Absolutely! You can exempt certain customers from taxes on the web interface. You can also mark certain products as taxable or non-taxable. Get to know how to do it here.
If VAT has been exempted for a particular customer, the following message will appear by default, in the 'Payment Details' section:
“VAT is not applicable on this invoice because a valid VAT registration number was provided and the reverse charge mechanism has been applied”.
You can customise this message as well.