To create a branch, navigate to the top toolbar and click the branch dropdown; you will be in the Main branch by default after creating a new pipeline workflow. In the dropdown, click Create new branch.
In the Create branch window, name your branch and choose to use the autogenerated Foundry branch name or to rename it. Dataset inputs will be read using this Foundry branch or the main branch if it does not exist.
Click Create to copy the current state of the Main branch and work from the new branch. You can navigate to other branches from the branch dropdown.