Help with adding space for bootcamp

Im helping a friend out and i dont know a darn thing about apple. so... This is the place i turn to. How do you add more space for bootcamp?

Add more? Do you already have space allocated? Or do you just have the entire drive for OS X now?

The bootcamp assistant in OS X is very easy to use, have you done that?

my friend ran low on space and needs more for his sims games.

Ok.

Give this a shot: http://www.paragon-software.com/home/camptune/

my friend is a little angry that we didnt try that first lol. We'll get it next time :D Thanks for the help.