Use Wrye Bash to 'esmify' the battlehorn esp file, make your mod, get it all done, and then 'espify' battlehorn again.
ZOMG thank you so much! i found what u where talking about at http://cs.elderscrolls.com/constwiki/index.php/De-Isolation_Tutorial saved me lots of googling time wish i would have asked this yesterday before i spent like the whole day trying to find this answer i svck at googling
thanks amber