Step 1:
First login into the admin and then click Pages—>click Add Sub Page.
Step 2:
Add new Sub page will appears..
step 3:
Fill all the field which is mentioned below:
Select main page
Page name
Page title
Css/scripts
Description
Hidden Page—>after giving this click submit button in the bottom of the page.
Step 4:
After submitting –>see that in list of pages.
Step 5:
After Submitting ,it will shows in the already existing Static pages list
Step 6:
The added sub page—>>need to visible in front end —>click UNPUBLISH as PUBLISH.