Plugin Subpages

Hi Girls and Guys,

I’m new to plugin development, so just wanted a quick point in the right direction.
Is there a way to have subpages in a plugin settings page.

I have added the settings page to the tools menu in the admin section.
I now want to be able to press an Add button to add a new field to the db, which is performed on a different page, how do I specify the new page, or do I need to just use $_GET and includes to perform the desired functions.

Thanks!
Jay