First you have to press SHIFT+CTRL+C then type exactly like shown TestingCheatsEnabled true Then hit enter.
Then you have to again press SHIFT+CTRL+C then type exactly as shown buyDebug on Then enter not go in to the buy mode and you should see a? Question mark in the lower right side of the buying tools. You can place any type of fish in your pond you can add any type of plane in your garden, you can add bugs and butterflies in your yard. And you can place gems in your yard. And you can add all of the vacation objects in your house or on your lot. This is the coolest cheat I found playing around with the game your Sim will advance quickly adding these objects in your Sims house and on your Sims lot. Have fun.
New Basement Tools and Rooftop
Open the console window (type [Ctrl] + [Shift] + C or [Ctrl] + [Windows] + [Shift] + C). With the console open, enter one of the following codes:
Turn on new basement tools: buydebug
Allow items on rooftops: allowObjectsOnRoof [on/off]
Additionally, the other sims 3 cheatcodes will also work.