[Help Needed] : Custom Model data Texturepack Minecraft Java 1.19.4

Hey friends , thanks for reading this :)

a friend of mine is making custom textures for my texturepack Neighter she or me can get it working though..

My idea is to keep all default textures the same (ish) but to add custom models and textures using custom model data for example .

I have a riot shield 3d Model i would like to get it functional without removing the Default SHield :)

i also have a Retexture for a Carrot which i would like as custom crafting recipe later but... well i need to add the textures first

if you have any experience please leave your discord below ill contact you asap

Please Make sure you are able to speak / type english without google translate .. thanks :)