If you mean cutting it literally, I did this once on a combination stone that I was taking into Venezuela. Took me ages with a hack saw, and I mean ages. If you plan on doin it with a full size stone, I suggest getting quite a few spare blades or cutting discs.
Yeah, I mean literally cutting it. It's combination stone, too.
Just leave the big waterstone at home and take a diafold double sided diamond hone.
If you can't get a decent working edge on a knife with one, give up and sell your knifes.