Within your workspace, you can use separate branches for changes you want to make for two different sandboxes, or for different versions of a feature that use the same sandbox.

For example, when modifying a table component in your extension, you might want to work on two different versions of the table. By creating a branch for each version, you can work on one version in one branch with Workspace A mapped to it, and then switch to another branch by using Workspace B to work on the other version. This way you can use your workspaces to help you isolate the branches with your changes. After you decide which version you want to use, you can share the branch with others and delete the branches you no longer need. See How Do Sandboxes Relate to Git Branches?.