Page Layout with Dropdown Menus Options

[MWSF1942]

I have been out of web page design for a few years except for basic stuff due to job changes. I have a dropdown menu with HTML and CSS pretty much created. Last time I did anything like I set up multiple web pages and used a JSP Include to bring in the header and another include to bring in the menu that was on the side. I have to do something quickly and hoping there is a new way to do this. So now that I have my dropdown menu, I can add links. I want to link to other pages I create and show them on the same page. Most examples I can find are about setting up the dropdowns and then any examples with real links open a new and unrelated page. Nothing that really shows how to use dropdown menus in context with a web page.

I hope this makes sense, thanks!!