Attaching a drawing/Doc with PR and an RFQ

Dear Gurus,

Kindly guide me how to attach a drawing or a doc number along with PR and RFQ.

My scenario is,i am sending RFQ for a material with material code,but the supplier/vendor who is going to receieve the RFQ will be able to give his quote only based on the product drawing.Kindly guide me how to attach the drawing in RFQ,PO and in PR.

Also guide me how to relese an RFQ,what is the T.code?

Thanks you very much in advance.