How Do I Generate Purchase Order?

How do I generate Purchase order from the shopping cart directly? I just want to select supplier and the products which are below the required stock limit must come on the purchase order sheet.

Any solutions?

I'm also trying to do this. Our previous cart let us enter the vendor, product code, cost etc. and when we wanted to create a PO we simply selected the products. Product Cost was also used in the COGS statistics but I can live w/out that for now.

I'll even settle for a QuickBooks integration if someone knows how to do it painlessly.