How-To: Use BuyDebug
1. Go into the lot you want to edit. (Build/Buy)
2. Press Shift-Ctrl-C together to bring up the cheat console, and type in testingcheatsenabled on.
3. Bring up the cheat console again and type in buydebug on
-- You should now be in buydebug. You'll know you have Buydebug mode on when in buy mode, you'll see a question mark button just above the buy mode library.