目前尚无此类REST API可以创建分支，我已经提交了

No such a REST API to create branch for now, I have submitted a user voice here to suggest the feature, you can go and vote it up to achieve that in future.

作为一种解决方法，您可以尝试以下方法在代码或脚本中创建分支:

As a workaround you can try below ways to create a branch in code or script:

• 就像@Shayki提到的那样，您可以使用客户端对象模型参考(如果要以编程方式管理版本控制).只需使用" CreateBranch()"方法即可 Microsoft.TeamFoundation.VersionControl.Client.VersionControlServer 类以创建分支.
• 此外，您还可以使用分支命令创建分支.

• Just as @Shayki mentioned you can use Client Object Model Reference if you want to manage the Version Control programmatically. Just use the "CreateBranch()" method in Microsoft.TeamFoundation.VersionControl.Client.VersionControlServer class to create a branch.
• Besides, you can also use the Branch Command to create a branch.

tf branch olditem newitem [/version:versionspec] [/noget] [/lock:(none|checkin|checkout)] [/noprompt] [/silent] [/checkin] [/comment:("comment"|@commentfile)] [/author:authorname] [/login:username, [password]] [/recursive]