Following the below steps you can easily bulk create Coaches in your TeamGenius account to assign to in season evaluations.

First click on Teams in the top menu and then click on Manage Coaches.

Next click on Import Coaches on the right side of the screen.

Click on Select CSV to Upload. 

You can download a sample CSV file to see how your upload of Coaches needs to be formatted. 

Next click on Confirm and Import.  (Note that Teams and Coaches are both options to import with this tool)

You have successfully created coaches!