You can copy a Contentbox section and paste into a new page via the Contentbox settings modal.
To copy a section
Click the BLUE COG icon top left of the section
From the Contentbox settings modal that appears, click the HIDE | MOVE | COPY SECTION button to open the settings.
Click COPY SECTION.
To paste a section
Navigate to the relevant Page / Content Area
If the editor used is not the Contentbox Editor you should change to it via the CHANGE EDITOR MODE dropdown top-right.
Click the BLUE COG icon top left of the section above where you want the section to be pasted
From the Contentbox settings modal that appears, click the HIDE | MOVE | COPY SECTION button to open the settings.
Click PASTE SECTION.
If you changed editor mode to Contentbox, you will have the default section still showing, you can delete this via the ORANGE X button at the top of the section.