In the product tab, you can easily build up vendor pricelists.

- Add the Vendor

- Add the price set for a quantity of the product OR the quantities and price set for those quantities

- Add a start date  and end  date (optional)

When you create a RFQ, select the vendor and the product, automatically the quantities and price set on the product will update.

If you use reordering rules, the RFQ created from a Sale order will take the first vendor and price of the list set on the product.