Replying to [ResourcesAdmin]:As per my experience we do the the step like this.
1) First we ask the price verbaly from the supplier and bargain. After fixing the price we send him a Pro forma Quotation to ask a Pro Forma Invoice(PI). After getting the PI we make the purchase order and place with the supplier. He put a delivery date sign and stamp on that and return to us.
2) After completion of making of product while shipping he make the following documents.
a) Commercial Invoice (Three Copies)
b) Packing LIst (Three Copies)
c) Certificate of Origin (Two Copies)
d) Bill of Lading ( Three Copies)
The Original documents need while getting the container in the destination country.
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