Do you mean that when you click on the button in the first section, you want another section to be launched and displayed?
If yes, you can have a click event on the button to invoke a 'local action' . The 'Target' can be set to "Modal Dialog", "Overlay" or "Replace Current". For your use case, you can try "Replace Current".
Please check OOTB section "pxUIGalleryButton" for the details.