Er, sorry I was a bit unclear.
In CT, there's no real transaction from, "overworld" and, "town."
Instead of going into a "town" (For example, in say, FF7, if you were interested in going into the town of Kalm, the town would be represented by a couple of houses and to enter you would go up and press X, which would bring you into the town, which would have the inns and houses etc.) In CT, you don't "enter" a town from the overworld, it's just there, spread out, and you access the stores/inns/houses FROM the overworld itself.
And thanks, Jake-A-Roonie. It's good to hear