The Clone functionality allows a user to copy a whole header or footer section from either the first page to the follow on page or vice versa, when using the follow on mode functionality.
To copy a whole Header or Footer area, simply select the Clone option in the ribbon, then select the relevant section, then which way you wish to copy (either First to Follow on or Follow on to First). A warning exclaiming what changes are to be made will then appear;
Note that this will change all of the grids contents for that section, including the dimensions. If you wish to edit this afterwards then return to the Template Setup dialogue to make adjustments as necessary.