After you have setup the multi supplier import a Import multi button will show on the import data page. 

Top menu >> Import data

Click Import multi

Select the Master agent import matrix and Choose File after. 

Click Upload.

The next page will show 3 options:

  1. Finish import: this option finishes the import
  2. View buffer: when supplier commission data is uploaded it goes into a temporary buffer so it can be reviewed before the import is completed. 
  3. Replace with new upload: this option allows you to replace the current import with a new one

See also: