question about AB lists

[ZeroOP]

I'm not sure if this belongs here, but...

Is it possible to make an army list as two non-"ally" forces, such as necron and eldar. I can't find out how. If it's not possible, with this be an option in the future?

[Spack]

Yes. Go to the roster rules and tick Apocalypse, and also tick "Trusted, Distruted, and Hated Allies" under the Apocalypse Allies section of those options. You can now choose either a Necron list and add Eldar allies, or vice versa, using the Roster > Select Allies menu option