When you add a new page to your survey, you can also choose to copy an existing page from the survey you are currently editing. Or you can choose to import a page of questions from a previously created survey.
You can still edit the copied or imported page as well as its questions afterwards by, for example, adding questions, removing questions, changing the page content and settings, or editing the questions within the page.
This way, you have a basis from which to start your work each time you create a new page. This is especially useful if you tend to create multiple surveys with similar questions; you don’t have to copy each question individually, and the pages within the original survey can act as a question library of sorts.