Use the "save as" option and rename the town so you know it is the one with the items you want. Then you just select that town when you want to play it. It will show up in the main menu with the new name. You can also go into your files, Electronic Arts/Sims3 files, select saves and open, select a copy option for the file. Move this copied file to a folder on your desktop and you'll always have it. When you want to play it you just move it back to the Saves folder in the Sims3 files. My desktop folder has a ton of different towns that I remodel in it but that keeps it from overloading my main Sims3 files.