The Search at the top of the site can be used to locate previous orders. Select "ORDERS ALL" from the drop-down, input the cart, req or PO number and then select the blue hyperlink for that cart.
Note - If you are looking to reorder a single part number, the Catalog Search includes all parts previously purchase by your company.
Review the original cart. Select "Duplicate Cart" to create a new cart including all of the items previously ordered.
Note - If the original cart was a Punchout cart, the allowed functionality will be limited.