List the Opportunity by sales team

Hi CRM Expert, 

We required to create sales team that consist of many people, previously no sales team in CRM, and sales people already created many opportunities. 

We created Several sales team and put some sales people in the sales team. However after create sales team, we still can see list of the opportunities for sales team. 

How to see opportunity if we want to list down by sales team instead of by user.

Thanks in advance.