Subpage links can be added to the sidebar menu of the parent page by changing the "Show in Menus" setting, in the page properties. The following steps explain the process:

1. After logging into HillTop, click the "Pages" link, in the menu at the top of any page. This will bring you to a list of the existing pages.

2. Locate the subpage you wish to add to the sidebar menu, then click the "Properties" button (gear icon) to the left of the title. This will bring you to the page properties editor.

3. In the properties editor, locate the "Show in Menus" option, then set the radio button to "Yes." After changing the setting, scroll to the bottom of the page and click the "Submit" button to complete the process. A link to the subpage should now be visible in the parent page's sidebar.