On the page that you want to move contents from, select the bits you want to move (a paragraph, column or a whole row), and make it into a component.
On the page you want to move it to, insert the component. You will need to click into the space where you want it to appear, or in case of a row, click the row before it.
Afterwards you can delete the content from the page where you don't need it. And if you don't need the component any more, delete that too.
Inger, Norway
My work in progress:
Components for Site Designer and the HTML Editor: https://mock-up.coffeecup.com