you can run the excel ballistic software in the ballistic forum. if you have docs to go or you can download gridmajic for free to your blackberry and sinc the program to your phone. if you do a search through the post i have made there is one that i posted a link to direction on exactly how to do it.
you can download any excel software to your bb and run the excel ballistic programs. I find the phone is quite a bit slower than a pda with exbal, too many other programs running in the background.
found the link ballistic's program for blackberry