When you create a new project, creating it based on custom project templates is a convenient bootstrap option.
Users can configure a GitLab group that serves as template source under a group’s Settings > General > Custom project templates.
Within this section, you can configure the group where all the custom project templates are sourced. Every project directly under the group namespace will be available to the user if they have access to them. For example, every public project in the group will be available to every logged in user.
However, private projects will be available only if the user is a member of the project.
Repository and database information that are copied over to each new project are identical to the data exported with GitLab’s Project Import/Export.