Hello Manuel Germano,
You can find a relevant discussion on this topic here:
Moving pages between containers
Additionally, you can create a new container by selecting the “Fork” option in the “Create as” dropdown and specifying the container you want to copy from. This will allow you to duplicate all pages, themes, logic, and custom functions from the original container.
https://backendless.com/docs/uibuilder/ui_containers.html
Regards,
Alexander