If you find yourself with the need to buy from multiple vendors for one product, Odoo can let you directly link them with a single product.
Add vendors in a product
To use this feature, go to: Purchases --> Products, then select a product.
From there you can add existing vendors to your product or create a new one on the fly.
Note that every first time the product is purchased from a new vendor, Odoo will automatically link the contact and price with the product.
Add price & quantity as well as a validity period
When you're adding a vendor to a product, you're able to add the vendor product name & code as well as set the minimal quantity, price and validity period.
Tip: This Odoo feature also works with variants of your products, such as one t-shirt in different sizes!