switching bells on locos

i have a question which hopefully someone can answer. how do you switch out the locos bell for example..the up ac45cte has the ge bell and the bnsf dc has the elctronic bell i dont know how to switch them out because im trying to reskin the bnsf es44dc to a bnsf es44ac with the ge standard bell that comes with the nathan k5l sound you hear on modern day trains.

Edit the cfg file hornsound

i mean the mesh bell not the actual hornsound.

Use Trainz Mesh Viewer to see if horn has a attachment point.
If no attachment point you can't change horn.
EZer way...If horn has a kuid number then it probably has a attachment point