For instance, the minimum order quantity for a month is 100 ltrs. And 1 ltr costs $20. You can define:

• If the customer buys more than 100 ltrs, the price will be $15 per ltrs.
• If the customer buys more than 150 ltrs, the price will be $10 per ltrs.
• If the customer buys more than 200 ltrs, the price will be $8 per ltrs.

These prices are automatically applied to the sales order when placing a new sales order. The pricing is updated only concerning the current month's order quantity status.

Defining price list:

You can select the product, set its minimum quantity, and set the fixed discount amount. The price is applied based on the quantity ordered.

Open the Sales module in Odoo. Click “Products” from the menu and click on “Pricelist.”

Click on “New” to define a price for a product.

Under the “Price Rule” tab, click on “Add Line.”

Choose the type of price you want to define from

• Fixed amount
• Discount

Select the type of products you want to apply the price to:

Define minimum quantity.

You can also add a time range to define its validity.

Click save.

Placing sales orders:

• Open the sales module. Click “New” to create new orders.
• Select customer, and choose price slab as “Monthly Order Slab.”
• Add product and quantity to be ordered.

• A pop-up appears "Click on update price. The discount will be applied if your customer has exceeded the minimum quantity order for the month."

• Click on "Update Price".