Alright the only way you can get the BoS to ally with the NCR is to complete all of the Brotherhood quests, after you do that you can go talk to Mcnamara and tell him the NCR is still hunting the Brotherhood and the only way that they can survive is to fight with them at the dam, Colonel Moore wont be happy about it but she'll still allow it to happen.
And no if you intend to side with House there's no way you can keep from destroying the Brotherhood.
Ok, so I have already given house the Plat chip and pretty much all I have left is to off the BoS BUT, I did all the BoS quests wayy back near the begining of the game and we are in good standing, so if I ally the BoS to the NCR NOW I will have to kill house and side with Yes man or the end quest cannot continue?
And killing House is not totally a bummer for me as he creeps me out, BUT I have this thing in my quests lists that says if I continue to help the Yes Man that the NCR will not allow me to work with them any longer.....yikes...
I think I'll just make some hard saves and try things out and see how it works out.
thanks for the quick reply!!