Unbound army looking for anwser

Hi, to every dark eldar player

I was thinking about maybe building an unbound (not cheesy list) with an eldar allied detachment.
So here is my question: can you take allied detachment with an unbound army ? and does the adventages ,like troops having objective secure, are still fonctionning in this case ?

I am just a noobie looking for anwser


P.S. sorry for bad english

No. You may not bring Detachments, aside from Formations, in unbound armies.

ok thank you a lot for anwsering