The New Genesis Sample includes only three layouts by default. This is because of the mobile-first CSS. It will conflict with popular layouts that's why it is unregistered by default in functions.php
This tutorial provides the simple way to add a secondary sidebar having the layout like Secondary sidebar-CONTENT-Primary sidebar in new Genesis Sample theme.
Remember: The Genesis Sample's CSS includes content and sidebar to be 100% till width 959px. We Will start our work with @media only screen and (min-width: 960px){} with a conditional css .sidebar-content-sidebar {
}
This will help to show sidebar properly for iPad pro and desktops, pcs.
Let's start.