Simple Sound Modding Question

[tenhats]

So I'm making a custom weapon for myself and I've been using other mods as a guide, been able to figure most of it out, but I'm hitting a roadblock when it comes to adding custom reload sounds. I know how to add custom firing sounds and how to replace existing reload sounds, but I want to add brand news reload sounds that I've made. Other mods some how manage to do this, such as the Caravan Shotgun mod, but I'm just not having any luck myself.

Any kind souls out there with an idea of how this works?