Companies flagged as Vendors in Manage are mapped to Vendors in Sage 50. The "Vendor XRef" field on the Manage Finance > Company Finance screen needs to match the "Vendor ID" field on the Maintain > Vendors screen in Sage 50. If a Vendor in Manage has a PO to be imported into Sage 50 and the Vendor does not exist in Sage 50, a new Vendor will be created in Sage 50 automatically.