How to override exsiting file

I want to make a new crossbow, but I seems I have to make new arrows to fit it, can i just make the arrow and change the exsiting arrow primal to support the new crossbow?"

make a new crossbow and set the “ammo” to use the default arrows
though i havent looked at crossbow/bows yet, but thats how you would create/change a slingshot

How to change the damage of the crossbow?I found a damage and change it to 1000, but it seems it’s just regular damage, however when i did it for rilfe it works, is there something different about bows?