You can apply a mass discount on an invoice to selected item types and save the discount to be permanent for the client. Mass discounts can only be applied to unfinished invoices.
- On the invoice page, select Tools > Mass discount at the bottom of the invoice.
- Select the Item types that you want to apply the discount for.
- Add the discount Percentage. If you want this discount to be permanent for the client, select the Permanent checkbox.
- Select Save.