Use the Templates feature to transfer a page from one project to another.
Click Pages on the bottom left panel in your Editor window and click the Templates link. Choose the My templates option from the dropdown menu. You will be prompted to create a template from whatever page you are currently viewing.
If some widgets have the On all pages setting active, you will see options to 'Include 'On all pages'' or 'Without 'On all pages'' when saving a page to your templates folder. The first option will save the template with On all pages widgets, the second will remove them from your new template layout.
To add your newly created template to another project, open its Pages panel, click 'Templates' and choose the 'My templates' option: you will see a list of your custom templates. To select one, simply click the associated preview. The page will automatically be added to your project.
To change the page order, drag the preview of the desired page up or down.
To delete a page saved to your templates, hover over the associated preview and click the cross icon at the top right corner.