just a quick question,

Is this how you would add another uh- not sure how to explain it - to this ?
{
  "parent": "minecraft:item/handheld",
  "textures": {
    "layer0": "minecraft:item/diamond_sword"
  },
  "overrides": [
    {
      "predicate": {
        "custom_model_data": 99
      },
      "model": "minecraft:item/penetrator",
  "predicate": {
    "custom_model_data": 50
  },
  "model": "minecraft:item/glitch"
}

  ]
}