EXS 24 Logic Sampler Users Group

Hi,

I'm looking for some advice on how to combine togetther several 
exs instruments in one instrument? 

For instance I have several string instruments bass-cello-violin 
etc. and right now they are in seperate instruments which only 
map out to part of the keyboard. I would like to combine them into 
one instrument that covers the whole keyboard range.

thanks in advance.
eric...