Globally updating x-refs

[Nancy Allison]

Hello. I'm about to break a 70-page chapter into three chapters.

Having split chapters before, I know what's going to happen: All of the 
x-refs to targets in the newly-created chapter will break. In other 
words:

Chapter 4 becomes Chapter 4,  5, and 6.

Now, all x-refs to the text that is now in chapters 5 and 6 will break.

Is there a global way to avoid this problem, or to fix it?

Thanks.

--Nancy