Use Barcode Nomenclature feature under Inventory setting

https://www.odoobooks.com/en/15.0/point-of-sale/scan_product_price_from_barcode.html

Use Priced Product Rule Types 

The barcode on the product has to be configre the 12 digit i.e. 231234500000. keep last 5 digit as 0 as it may different according to the price.

Barcode Pattern is 23…..{NNNDD} it describes that the total size of the barcode is 12 digit. It start with 23, then 5 digit product code at last it have the 5 digit product price can be configured.

Hi,we can handle this situation by First In First Out(FIFO) costing type of Odoo 16,

For more details, refer to the blog:

https://www.cybrosys.com/blog/what-are-the-different-types-of-costing-methods-in-odoo-16

Hope it helps

Please unlock the purchase order and split the product into two separate lines with different unit prices. Ensure that the purchase order amendment occurs before completing the goods receipt note (GRN).