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OLE doesn't have a bulk upload option for Vendors considering the relatively less volume of data compared to Patrons or Bib data. An Implementer will have to manually load data across the tables to get the system working properly.
This The following workbook lists the tables required to populate the vendor file, and gives examples from Chicago's implementation and the default TST database:
Michelle Suranofsky wrote this script to populate the vendor file at Lehigh University: loadvendorstocsv.php