Final answer:
A promotion branch is commonly created in a software development workflow when user stories are ready to be moved to a higher environment, after being completed and tested.
Step-by-step explanation:
Debbie has created a promotion record to add all the user stories she has been working on during the past few days. Regarding software development and version control systems, a promotion branch is usually created when changes are ready to be moved from one environment to a higher-level one, such as from a development environment to a staging or production environment. The specific timing of when the promotion branch is created can vary depending on the project's workflow or the policies of the development team. Typically, a promotion branch is created after all user stories contained in the promotion record have been completed, fully tested, and approved for release. However, the exact point at which the branch is created could be specific to the version control or branching strategies being used, such as Git Flow or Feature Branch Workflow.