Does anyone have a document showing the work that is required to split a live cube in 2?

There's no real documentation as I don't know of how many customers have done it. I split at a prior customer but when we got nearly there, they canceled the project and decided not to split.

It would be easiest to start with an empty application, then bring over the elements you want in the new app. It's essentially a re-implementation but you have a head start on creating a bunch of stuff.