Adding a discount to an event can be done by first creating a product via setup with, for example, the name 'discount'. Give this product a negative amount (e.g. € -12,00). Now add the product to an event. The discount rate (and possibly the product name) can always be changed manually in the event.

Please make sure that you place the discount rate below the correct VAT rate so the discount is properly reflected in the cost overview.

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