Ok, I have two worlds now, after downloading one from TSS. I wanted to know could my Sims travel separately? I tried moving one of my sims to her own house in another town, and the rest of the family followed, and I ended up with two games, just diff worlds/towns. How would I get my sim to live in a diff town in the same game? Or i it not possible?

Umm, I don't think so. Remember, when you move town, you leave behind friends, family and jobs. So, in case you want to keep all that, the game saves the old save file and the new one. If you really don't want to keep all the info, just delete the old save file.

It's not normally possible, but Nraas Traveler mod makes it possible. It'll let you do exactly what you want. Your sim can move, but still keep relationships. She can invite her family over to the new town to visit, or she can go back home to visit them.

Oh ok, I need to get that. But why does the whole family move when I only want one person to move?

I'm pretty sure you need World Adventures to do what you want to do, having the mod doesn't just give you that option without the EP. Read the info over at Nraas for everything you need to know about Traveler.