In odoo to support business across the globe and international business norms Purchase and sales order will both hold a space for Incoterms. A series of pre-defined commercial terms published by the International Chamber of Commerce is defined and followed all over the world as Incoterms. Intended primarily to clearly communicate the tasks, costs, and risks associated with the transportation and delivery of goods.
Update Incoterms related to purchase process here under the Purchase>> Purchase>> Quotations -RFQ and Bid tab. Find below screengrab helpful when applying your changes.