Is it Possible to shrink a FBSD Partition?

[Chris Collins]

Hello

Is there any easy way to shrink a freebsd partition? When I created the 
slice (I think it is called) I used the complete drive. 

I need some space to create another partition and do not wish to reinstall 
FBSD. This machine has been up and running for sometime and to do a 
reinstall would be a big pain. 

I have tried partition majic then reading some info online it does not look 
like it can handle the job.

I am running 4.8 Stable.

Any info would be great.

Thanks
Chris