They call it making "aliases". They look kinda like this :
alias mon "moveObjects on" "Move Objects On" "Move Objects On"
(cheat command, short description, long description)
So if this person wanted to activate the Move Objects On cheat, they would just type in
mon to do it.
Here's a better link with clearer instructions & even a pre-made userstartup.cheat you can download and alter for your own purposes. (Which is what I did! )
http://www.modthesims2.com/article.php?p=1236797
-ZW