The file can be loaded with the Internal type identification number (IT) just adding the Customer reference (CUS), Customer, product name (CUSPART) and PART.

This file can be loaded using the ARTUPLOAD job. (INP/14542 ARTUPLOAD) 

It can be loaded without the Internal type identification number  (IT) too - but the user will need to create 2 files: 

1. One file to load the articles 

2. Extract a copy of the articles

3. Add the customers external id (CUSEXTID) and customer's product name (CUSPART) as 2 new columns.

This will make it possible to load customer's product name  CUSPART without including the IT in the file.

Both files can be loaded using the ARTTUPLOAD job.

More information can be found here: Load CUSPART