No need to develop this module you can do it as the following: 

Odoo has a powerful pricelist feature to support a pricing strategy tailored to your business. A pricelist is a list of prices or price rules that Odoo searches to determine the suggested price. You can set several critarias to use a specific price: periods, min. sold quantity (meet a minimum order quantity and get a price break), etc.

As pricelists only suggest prices, they can be overridden by vendors completing sales orders. Choose your pricing strategy from Sales ‣ Settings.

Note

• A single sale price per product : doesn’t let you adapt prices, it use default product price ;
• Different prices per customer segment : you will set several prices per products ;
• Advanced pricing based on formula : will let you apply discounts, margins and roundings.

Several prices per product

To apply several prices per product, select Different prices per customer segment in Sales ‣ Settings. Then open the Sales tab in the product detail form. You can settle following strategies.

Prices per customer segment

Create pricelists for your customer segments: e.g. registered, premium, etc.

The default pricelist applied to any new customer is Public Pricelist. To segment your customers, open the customer detail form and change the Sale Pricelist in the Sales & Purchases tab.

Temporary prices

Apply deals for bank holidays, etc. Enter start and end dates dates.

Tip

Make sure you have default prices set in the pricelist outside of the deals period. Otherwise you might have issues once the period over.

Prices per minimum quantity

Note

The prices order does not matter. The system is smart and applies first prices that match the order date and/or the minimal quantities.

Discounts, margins, roundings

Advanced pricing based on formula allows to set price change rules. Changes can be relative to the product list/catalog price, the product cost price, or to another pricelist. Changes are calculated via discounts or surcharges and can be forced to fit within floor (minumum margin) and ceilings (maximum margins). Prices can be rounded to the nearest cent/dollar or multiple of either (nearest 5 cents, nearest 10 dollars).

Once installed go to Sales ‣ Configuration ‣ Pricelists (or Website Admin ‣ Catalog ‣ Pricelists if you use e-Commerce).

Each pricelist item can be associated to either all products, to a product internal category (set of products) or to a specific product. Like in second option, you can set dates and minimum quantities.

Note

• Once again the system is smart. If a rule is set for a particular item and another one for its category, Odoo will take the rule of the item.
• Make sure at least one pricelist item covers all your products.

There are 3 modes of computation: fix price, discount & formula.

Here are different price settings made possible thanks to formulas.

Discounts with roundings

e.g. 20% discounts with prices rounded up to 9.99.

Costs with markups (retail)

e.g. sale price = 2*cost (100% markup) with $5 of minimal margin.

Prices per country

Pricelists can be set by countries group. Any new customer recorded in Odoo gets a default pricelist, i.e. the first one in the list matching the country. In case no country is set for the customer, Odoo takes the first pricelist without any country group.

The default pricelist can be replaced when creating a sales order.

Tip

You can change the pricelists sequence by drag & drop in list view.

Compute and show discount % to customers

In case of discount, you can show the public price and the computed discount % on printed sales orders and in your eCommerce catalog. To do so:

• Check Allow discounts on sales order lines in Sales ‣ Configuration ‣ Settings ‣ Quotations & Sales ‣ Discounts.
• Apply the option in the pricelist setup form.