If you'd like to offer your patients a discount on either a treatment or an item,  WriteUpp allows you to apply a discount as either

a numeric value eg £10 discount
a percentage, eg 10% discount

Discounts are applied when you create an invoice -> How do I apply a discount to an invoice?

A discount is applied against an item on an invoice (for example an appointment or an expense) rather than against the whole invoice and its total value. This allows you to control what items are discounted if you include more than one thing on an invoice.
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