Can the CMDB GRLoader load via a CSV file, Models and Manufacturers into the CMDB?
CA Service Management 17.x
GRLoader cannot be used to import/add just Models and Manufacturers into the CMDB.
GRLoader is intended to add Configuration Items (CIs) and their associated attributes into the CMDB.
Once alternate approach would be to use the pdm_load command to import/add Models (ca_model_def MDB table) and Manufacturers (ca_company MDB table).
The following Community Post has useful information regarding the use of the pdm_load command.