The Create New Branch action allows you to create a new branch in the current repository.
Enter a value for the New Branch Name in the field provided.
Specify the workspace that you are using (this field can be populated with the default workspace if you have specified one on the options page).
Under the options section you can specify whether to create the new branch as a top level branch or as a child branch of a branch that already exists. When creating the new branch as a child branch you must specify the name of the parent branch.
When creating a branch that is a child you must specify the complete reference of the parent branch.
To create a child branch called child2 which is a child of the main/child1 branch you would need to specify main/child1 (as opposed to simply child1) in the parent branch field. Without the complete parent branch reference the action will fail.