Team Manager as a Coach Type through:
  1. Core  > Users  > User profile settings
  2. Click on Personnel types
  3. Click on Add Type
  4. Name: Team Manager, Type: Coach
  5. Click Save
Then you would add users to this role through:
  1. Extracurricular > Athletics  > Athletics setup >  Manage Coaches
  2. Select Edit for the Team in question
  3. Click Add Coach
  4. Search for user by last name and click >> to add
  5. Select Next
  6. Select Team Manager from the drop down then click Save & Exit