1. Open the sidebar menu on the right-hand side of your screen. 

2. Choose Calculations.

3. To choose a discount, simply click on the drop-down menu. You can either pick one from your existing settings or opt for a custom discount, which allows you to create a one-time offer. Discounts can be specified as a percentage (%) or a dollar ($) value. Additionally, you have the option to include a description for the discount, which will be visible in the subtotal box.
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