Only organization owners and maintainers of a parent team can create a new child team under a parent. Owners can also restrict creation permissions for all teams in an organization. For more information, see "Setting team creation permissions in your organization."
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.  
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Click the name of your organization.  
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Under your organization name, click Teams.  
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On the right side of the Teams tab, click New team.  
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Under "Create new team", type the name for your new team.  
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Optionally, in the "Description" field, type a description of the team.  
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Optionally, if you're creating a child team, use the drop-down menu to choose a parent team for your new team.  
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Decide whether the team will be visible or secret.  
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Click Create team. 
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Optionally, give the team access to organization repositories.