Hi,

Pricelists allow you to adjust product prices depending on various criteria automatically. For example, you can set POS-specific prices, create temporary discount periods, reward specific customers, or offer discounts when set quantities are ordered.

1. From the Settings menu of the Sales module, you can activate the Pricelists

2. Select the advanced price rules

3. sale-> products-> pricelist-> create

4. Choose price computation as 'fixed' and enter the fixed discount.

5. Apply on -> All products 6. Save

For more details, refer to the blog:

https://www.cybrosys.com/blog/how-to-set-multiple-prices-per-product-and-discounts-in-odoo-17-sales

Hope it helps