Step 1: Create a Discount item:
- Go to Settings > Drop Down Lists > Products & Services.
- Click Add New Item.
- Select Discount or Discount %.
- Enter the Rate.
- Click Save
Step 2: Apply the discount
- Open the estimate for the job you want to discount.
- Add the newly created discount item to the estimate.
- Save the estimate.
- Note that the discount is applied to the last line item