First click Teams on the left side of the app, then click Join or create a team at the bottom of your teams list.
Then click Create a new team at the top right of the app.
From here, select Create from…, then choose Team.
You'll see a list of teams that you currently own or belong to.
Choose the team you want to copy.
Now you can name your team, add a description, edit the team privacy, or edit the team's data classification, if your organization has set this up. You can also use the check boxes to pick which parts of the team you want to copy: channels, tabs, settings, apps, and even members. When you’re done, click Create.
Now you can invite people, groups, or even entire contact groups (formerly known as "distribution lists") to join your team.
Tip: After you copy the team, you’ll still need to configure the settings for apps and tabs.