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In most cases the Assignment Code is created automatically by the importing of your commission data. Best practice is to have both the Assignment Codes value and Account value to be the same, you can set this up in the Import matrix

View the Rep.

On the Rep page find the Assignment Codes box and click Add an assignment code

The Assignment Codes box might be in a different position as you can drag and drop the boxes around and change the layout of your page. 

Click Add multiple Assignment Codes and assign them.

Add the Assignment Codes in the area next to the supplier(s) you want to add the Assignment Codes for.  

You can only create one Assignment Code per supplier at a time.

Click Finish when done.