Importing Full Neighborhoods into TS2
Below is an article from The Sims 2 Official Game guide from Prima.
Entire neighborhoods including their terrain, residential and community lots, families in lots, decorations, families in the Family Bin, and NPCs can be manually shared with other users.
Every neighborhood has a folder in "My Documents/EA Games/The Sims 2/Neighborhoods", each identified by the letter "N" followed by a three-digit number.� All files contained in this folder feature this same prefix.
This folder can be copied to any other user's folder but will overwrite any folder with the same name in the recipent's Neighborhood folder.� Make sure the folder has a unique number and every file in the folder is changed to reflect�this new number (it's a lengthy process).