Older Army Books
 

I just bought the new 8th edition rulebook. I have the most recent Dwarf book and am getting the newest Tomb Kings book. I do, however, have an old version of the Hordes of Chaos book. Is there a way to use these books simultaneously or will I have to upgrade my books (especially when the new Dwarf book comes out)?

Thanks,
-Bill

Possible solution
 

I've come up with a possible solution. I really only gave a bunch of bloodletters and a Daemon Prince for models, so I could use the current Army Builder data, buy the appropriate models as I build an army and then get a newer book. Thought I had a bunch of Knights and some marauders, but they must have ended up in a trade some time ago.