Before creating a regional page, make sure that there are 'terms' for the city or region in the relevant Vocabulary - see here for Adding and Managing Terms and Vocabularies
To create another regional page, open an existing regional page, click Edit, under Body click Disable Rich Text and select all and copy.
Then under Create Content, click on Page.
Give it the relevant title, set it up under Menu to show under the relevant Parent item (scroll right to the bottom of the list to find these).
Then in Body, click Disable Rich Text and paste from your clipboard.
You then need to overwrite the ID number of the term with the one for the city/region that you are creating.
So for example, the code for Palmerston North region page shows the below
/searchcom/results/taxonomy%3A630,578" Palmerston North
/searchcom/results/taxonomy%3A527,578" Manawatu-Wanganui region
The code for Palmerston North is 630 (you can spot this any time you hover over a link to that term) and for Manawatu it is 527 - so you will need to replace this with the ID for the new city/region.