Create a team from an existing group
When you create a team from an existing Office 365 group, you'll automatically share the same group privacy (public or private) and members as the original group.
Note: Your organization can restrict who can create teams. If you can't create a team or need to turn off team creation, check with your IT admin.
- 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 team
(first card, top left corner). - From here, select Create from…, and choose Office 365 group.You’ll be presented with a list of groups that you currently own, don't already have a team associated, and have less than 5000 members
- Select your desired group, and a team with the same name will create automatically. The team will share the same group privacy (public or private) and members as the original group.
Notes:
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This option is not available for groups that have more than 5000 members or have already been used to create another team.
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Groups created through Yammer cannot be converted to a team.