Anki Small Questions Thread - (NO Technical / Troubleshooting Posts)

Ok, I have another question...

I have a deck for RTK2 the book, 5th edition. I want to update it to the 6th edition. I am planning to make a new field (I think that's what it's called) to add the RTK2 6th edition frame numbers into.
So my question is this: how can I get anki to sort the deck using the new frame numbers from the 6th edition instead of the ones it uses now?

Thanks!