Step1: Login to Super Admin account and go to Setup > User Management > Organization Groups.
Step2: Click on ' Create ' Button.
Step4: Click on 'Add' button in front of the Organizations
to them to the group.
Step5: Here you will assign the user as a channel manager of the group.
Click on 'assign' button to assign the desired user as Channel Manager.
Now the assigned user will be channel manager of the organizations (all users within the organization) added to this group.