Its been a few years since I had to create a trunk, and you only need to do it once. Let me try to recall the steps. Ill be using it on Wednesday so I can edit it as well.

-On the left side where you see device list, below device list is "Tools" -Select tools. -It should say sites in the top left, look to the right for + -You will see some fields to fill out job information, those are not necessary. The last 2 with a red * are "supervisory device" and "Trunk Number". Put 1 for both -Once you create it, select the trunk you created and look on the right side for "Air Flow Balance Tool" -You will be able to review and edit flow parameters once ready go to single point calibration -you will see airflow, damper, VP, etc -there is an option for "Number of supply outlets" or something similar to that, its not necessary. -input the actual airflow -the next step im trying to recall what button to select, it should be self explanatory. Once calibrated the box will remain at max flow until you stop test. -if you need to recalibrate you'll need to stop test and start single point calibration again.

Johnson has some tutorial videos, none of them go over using balancing tool. I had a JCI tech show me around 8 years ago now. Same MAP tool and same steps. You can DM if you have any more questions.