How to add an entity with multiple model

I want to create a single entity with multiple models and textures.

I would like to be able to generate this entity by combining different parts in the game.
And I want the same entity to look different (e.g. the ability to craft a car with the "Ultimate Car Mod").

I expect that the NBT tag is involved, but I don't know how to implement it.

Would I need to modify the source code to create this entity?
Also, if modification of the source code is necessary, I would like to appreciate suggestions on how it should be modified.

My working environment is shown below.
　Mcreator version: Mcreator 2023.3
　3D model working environment: Blockbench version 4.8.3
　3D model extension: Java

※I am not from an English-speaking country and cannot write English well, so I am using a translation tool. Please understand.