Creating a subpage
Using Parent Pages is a good way to organize your site’s Pages into hierarchies. A parent page is a top-level page, with sub pages nested under it.
To create a subpage under a parent page:
Log in to your WordPress admin screen.
Click the Pages > Add New in the left sidebar. Alternatively, you can also click the Add New button in the Pages screen.
In the sidebar settings for the page, under Page Attributes, open the Parent Page drop-down menu. This will list all the Pages already created in your site.

Select the desired page from the drop-down menu that you want to be the parent page for the current you are creating. The current page you are creating now becomes the sub page for the parent page you choose.

You can change the order that your pages are displayed when using a default menu, by using the Order field of the Page Attributes module. Put the number 1 in the box for Order. This tells WordPress to display this page first on your site.
Add a title for the sub page.
Add body content for the sub page.
Click Publish when ready.
Repeat the process for your other sub pages you want to be disapled under a Parent page, but use higher numbers for the Order field: 2, 3, etc. This tells WordPress to display these pages second and third on your site.
When your Pages are listed, the child Page will be nested under the parent Page. The Permalinks of your Pages will also reflect this page hierarchy. In the above example, the Permalink for the Board of Directors Page would be: