Maybe it would make sense to practice with the RAMDISK: first.
In the Workbench user interface, you would simply drag an icon that represents a file (like the Clock program from the Amiga dos disks) into the opened RAMDISK window. This copies the icon AND its associated program file to the RAMDISK. If you double click it, it will execute from there. When the RAMDISK window is highlighted (single clicked inside the box), you can choose New Drawer from the Window menu and create subdirectories 'til your hearts content. You can move programs and files to these subdirectories. When you power down, nothing permanent was done, everything on the RAMDISK is lost.
You can do the same thing with Hard drive, double click its icon and open its window.
Is this what you need??? Did you get any docs with the Amiga?
Maybe you are asking where to put things on a HD formated to be a single partition? You can create additional subdirectories (MyFiles, Apps, Games, Archives, Sounds, Work, whatever) on the HD to logically organize the stuff you want to add. Most install scripts look for a partition named WORK (or a directory assigned to the name WORK) as a default location to install programs and associated files.
