There are a few options for raising handle bar height, if that is what you are looking for.
First; is getting handle bars with a high upward sweep, similar to those used on BMX bikes.
2nd is installing a handlebar stem with a angle adjuster. These can swing 60 degrees up or down. They can add about 1-2 inches of height.
3rd is a fork stem extension (also known as a riser). This slides onto the fork stem and adds 2-4 inches to your stem height, thus raising the handle bars.
Hope that is what you are looking for