TFS: submit changes done locally in one branch to another branch

This functionality is provided using tfpt unshelve /migrate. To use it, follow these steps:

1. Create a shelveset of your changes (from the UI, or tf shelve . /R)
2. Create the new branch
3. Download and install the Team Foundation Server Power Tools
4. From a Visual Studio Command Prompt, run the following command: tfpt unshelve /migrate /source:$/TeamProject/Main /target:$/TeamProject/Beta

This will essentially re-write the paths in your shelveset to the new branch.