You can create a new page to show as a subpage of another page in the site, so that the new page is shown underneath the original page in the navigation menu of the site.
You can create a new page to show as a subpage of another page in the site as follows:
Click on the Pages tab on the pane on the right-hand side of the screen
Position the mouse over the page you wish to create a new page underneath, then click on the ellipses to show a menu of options
Choose Add subpage from the menu displayed
Enter a name for the sub page
Click on DoneÂ