At the moment, it's not possible for one person to manage more than one team.
However, below, we've collected some helpful tips that may help you accomplish the same goal:
- Group all of the users they manage into one team and use tags to categorize these developers based on team, programming language..etc.
- Leverage the API to build a dashboard for the 'Team Manager' so they can track the progress/metrics of all teams they manage.
- Assign them a Company Admin role (This will give them access to all teams).
- Create a separate account for the 'Team Manager' under each team (not recommended)