To ensure that all purchase orders default to a specific warehouse, you can configure the default warehouse settings at the company level in Odoo 18. Navigate to Inventory → Configuration → Warehouses and select the warehouse where purchased goods should be delivered. Within the warehouse settings, ensure that the Incoming Shipments are correctly routed to the appropriate Stock Location that aligns with your procurement process. Once saved, this configuration will automatically apply to all new purchase orders, setting the ‘Delivery To’ field to the specified warehouse by default. This approach helps maintain consistency across all purchases and prevents manual selection errors.

You could set that as default, create a new RFQ, populate the desired receipt operation/ deliver to location and set as default