This is a feature of Odoo 17.

There is a Discount button at the bottom of the Quotation / Sales Order that gives you three options:

Hi,

To display the total discount on a quotation in Odoo, follow these steps:

1. Add a Field to the Quotation Form:
   • Navigate to the quotation form in Odoo.
   • Click on the "Edit" button to enter edit mode.
   • Add a new field to represent the total discount.
2. Access Field Properties:
   • Click on the newly added field.
   • Click on the "More" button or the field label to access its properties.
3. Navigate to Field Form:
   • After accessing the field properties, you will be redirected to the field form.
4. Write a Compute Function:
   • In the field form, locate the field's Compute field or option.
   • Write a compute function based on your requirements to calculate the total discount.
     • This compute function should calculate the total discount based on the discounts applied to the quotation lines or any other relevant factors.
     • You can use Python code to define the computation logic.
5. Save Changes:
   • Once you have written the compute function, save your changes.
6. Test the Field:
   • Exit edit mode and test the newly added field on the quotation form.
   • Ensure that it correctly calculates and displays the total discount based on your compute function.

By following these steps, you can add a field to the quotation form in Odoo and configure it to display the total discount based on your specific requirements.

Regards