Opportunity Teams in Salesforce help multiple Sales Reps/Users to better collaborate on the opportunities by defining a role for each team member, setting record-level access individually, and viewing teams in list views and reports. 

Opportunity Teams in Salesforce is easy to setup and allow Sales Reps/Users to collaborate on the opportunities. 

When enabled, the opportunity teams are available in Salesforce Lightning, Salesforce Classic, and the mobile app. Users may prepare default opportunity teams for speedy setup of new opportunities. Opportunity Teams are not the same as account teams.

1. Go to Setup –> Build –> Customize –> Opportunity –> Opportunity Team.

2. Enable Team Selling.

3. Select the layouts in Page Layout Selection.

4. Add team members using Opportunity Team related list.