How do I create sub-pages in iWeb?

To create sub pages, just ensure that the main menu item is in the main menu and then for the sub pages themselves, ensure that they are NOT in the main menu and you link back by creating links instead.

For example, you could use Staff as a main menu item, so Staff would be in the main menu and then descriptions of different staff members would be underneath, but not in the main menu - they would have separate links that you create and then hyperlink.

If you want to make drop down menus in iWeb, as in the site that you linked to, you can't do this directly in iWeb itself. You have to make it and then upload various css files to your web host and link to it in iWeb etc. It is quite a complex task to create drop down menus in iWeb. If you want to do that, then I would suggest that you use a different app instead - take a look at http://www.everwebapp.com.

If you are using the iWeb navigation menu, then simply open the Inspector in iWeb and go to Page and then check "Do not display page in navigation menu" and it won't be displayed and you can then use the hyperlinks instead.