You can drag and drop your sections into the correct order. If you want a section to become a sub-section of another section then just drag it onto the section that will become the parent section. To move a section at the same level, press the 'Shift' key (and keep it pressed) while you drag the section onto the section that it is to go underneath.
Alternatively, Mole-End Software provide a sorting tool - view more details here.
Alternatively, Mole-End Software provide a sorting tool - view more details here.