Creating a branch
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On GitHub Enterprise, navigate to the main page of the repository. 
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Optionally, if you want to create your new branch from a branch other than the default branch for the repository, click NUMBER branches then choose another branch:  
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Click the branch selector menu.  
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Type a unique name for your new branch, then select Create branch.  
Deleting a branch
You can't delete a branch if it's currently associated with an open pull request.
- On GitHub Enterprise, navigate to the main page of the repository.
- Above the list of files, click  NUMBER branches.
 
- Scroll to the branch that you want to delete, then click .
 
For more information, see "About branches."