If you want to reuse an existing model of content-page, you can use the “Clone” mode.

1) Go to the administration content page.

2) Find the content you want to clone and click the arrow, at the right, to open the drop down menu.

3) Click "clone".

4) Proceed with clicking "clone", once more, at the end of the new page that appears.

A new piece of content is created based on the first one.
You can now edit it.