With testingcheats true enabled, you can enter the following codes from the console for the corresponding effects in Build Mode.

Code	Effect
[ and ]	The left bracket enlarges an item and the left one shrinks it.
9 and 0	You can raise and lower objects using the 9 or 0 keys.
bb.moveobjects on/off	You can merge objects together and place them wherever you wish.
bb.showhiddenobjects	Items that normally must be found or dug up are now visible.
bb.ignoregameplayunlocksentitlement	All build items you would typically have to earn are unlocked.