When you have a Visual Studio Team Services account with a Team Project created, you can import an existing Git repository in your VSTS Team Project. You will find the “Import repository” option from the repository drop down.
Import an existing Git Repository in your VSTS
Open the Team Project in Visual Studio Team Services Portal and navigate to the Code menu. From the repository drop-down, select the “Import repository” option.
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This will bring the “Import a git repository” option, where you need to provide the Git URL and required the credential to clone the repo. You also need to provide the new repository name.
Once all the information is provided, click on the “Import” to pull in the existing Git Repo to your Visual Studio Team Services Team Project.