You can import a project from the File / Import menu item in the main menu. When importing a project, all the Kinds, JavaScript Gatherers, Actions Trees and datatables are merged from the imported project into the current project. This allows you to easily share and reuse projects from existing projects, and is particularly useful when combined with Actions Trees that make use of the Execute Caller's Children action and the Actions Tree Setup HTML.
Kinds, Actions and JavaScript Gatherers in the imported project that have the same name as corresponding elements in the current project will either produce an error if their contents are different, or be merged into a single item if their contents are identical.