I've never played it on PC (since my computer isn't meant for this kind of gaming), but I've done it on PS3 for awhile, I'm not sure if you can just edit/add/delete multiple families from the town, since you only have the Continue/New option in the Main Menu. You inventory is accessible from your Sim, if you click on them, you can find at the bottom of the options a Inventory button. There you can access your inventory, your houses inventory (food in fridges, books in bookcases, and toys in toychests), and the Offsite storage for items you don't want to have taking up space in your inventory/house (example: moving houses, puts items you want to keep there, if your Sims often try to go on their laptops when you want to build other skills, you can put laptops here, etc) This inventory is also accessible from the Build/Buy menu under the Family Inventory option. Hope this helped.